I found all of these online through web searches 
Enjoy!
Our House Elves Drink Sherry During Christmas
(Randy Estes – Have Yourself a Merry Little Christmas)
Our house elves drink sherry during Christmas
And they all get tight!
Some plow on
Keep drinking and stay out all night!
Our House elves drink sherry every Christmas
Made the Boone's Farm way,
One season
Our whole crew was found miles away!
There they were in a purple haze
Had not slept for days, outdoors
Found by friends who lived near to us
Helped them catch a bus down shore
Through the years they all will be together
If the matron allows
Says she'll trade them all for just one Guernsey Cow
But our house elves drink sherry during Christmas now.
* * * * * * *
Tipsy the Red-nosed House Elf
(Dennis Maggard - Rudolph the Red-nosed Reindeer)
Tipsy the red-nosed house elf,
Had a very shiny nose,
Some said the cooking sherry
Was the source of all its glows.
All of the Hogwarts house elves
Doubted his sobriety,
They never let poor Tipsy
Join in doing work for free.
Then one dreary Christmas Eve,
Dumbledore did say,
"Tipsy with your nose so bright,
Help to light the feast tonight."
Then all the house elves loved him,
As they shouted out with glee,
"You'll be remembered, Tipsy,
In Hogwarts: A History!!"
* * * * * * *
Peeves the Poltergeist
(Lilac - I Saw Mommy Kissing Santa Claus)
Peeves the Poltergeist was filling-in
Dirty lyrics into Christmas songs.
The armor suits forgot
All the words, and Peeves had thought
He'd add some phrases nasty that would
Makes one's face all hot!
Peeves the Poltergeist was chuckling
Since he did embarrass everyone.
Now I'll never sing straight-faced
The song What Child is This?
Peeves tainted all the Christmas songs last night!
* * * * * * *
I'll Use Gnomes for Christmas
(Found online (author unknown) - I'll Be Home for Christmas)
I'll use gnomes for Christmas,
High atop the tree
With some glue and a tutu
They'll glower down at me.
Late one night one bit me
On my ankle bone
I'll use gnomes for Christmas,
When stupefied like stone.
* * * * * * *
The Twelve Days of Christmas
(Compilation of parodies by Catherine Johnson & Benjamin Wick, Ivy & Gracie, Bighead Girl & MagicPoni, & Luke Brattoni with original lines by Sagira)
On the first day of Christmas, the Owl Post brought to me
A bowtruckle in a yew tree!
On the second day of Christmas, the Owl Post brought to me
Two chocolate frogs,
And a bowtruckle in a yew tree!
On the third day of Christmas, the Owl Post brought to me
Three black work robes,
Two chocolate frogs,
And a bowtruckle in a yew tree!
On the fourth day of Christmas, the Owl Post brought to me
Four Hogwarts Houses,
Three black work robes,
Two chocolate frogs,
And a bowtruckle in a yew tree!
On the fifth day of Christmas, the Owl Post brought to me
Five lemon drops!
Four Hogwarts Houses,
Three black work robes,
Two chocolate frogs,
And a bowtruckle in a yew tree!
On the sixth day of Christmas, the Owl Post brought to me
Six owls off mailing,
Five lemon drops!
Four Hogwarts Houses,
Three black work robes,
Two chocolate frogs,
And a bowtruckle in a yew tree!
On the seventh day of Christmas, the Owl Post brought to me
Seven years at Hogwarts,
Six owls off mailing,
Five lemon drops!
Four Hogwarts Houses,
Three black work robes,
Two chocolate frogs,
And a bowtruckle in a yew tree!
On the eighth day of Christmas, the Owl Post brought to me
Eight firsties running,
Seven years at Hogwarts,
Six owls off mailing,
Five lemon drops!
Four Hogwarts Houses,
Three black work robes,
Two chocolate frogs,
And a bowtruckle in a yew tree!
On the ninth day of Christmas, the Owl Post brought to me
Nine wands a-stunning,
Eight firsties running,
Seven years at Hogwarts,
Six owls off mailing,
Five lemon drops!
Four Hogwarts Houses,
Three black work robes,
Two chocolate frogs,
And a bowtruckle in a yew tree!
On the tenth day of Christmas, the Owl Post brought to me
Ten points from [enter House name here]
Nine wands a-stunning,
Eight firsties running,
Seven years at Hogwarts,
Six owls off mailing,
Five lemon drops!
Four Hogwarts Houses,
Three black work robes,
Two chocolate frogs,
And a bowtruckle in a yew tree!
On the eleventh day of Christmas, the Owl Post brought to me
Eleven wands a-waving,
Ten points from Gryffindor,
Nine wands a-stunning,
Eight firsties running,
Seven years at Hogwarts,
Six owls off mailing,
Five lemon drops!
Four Hogwarts Houses,
Three black work robes,
Two chocolate frogs,
And a bowtruckle in a yew tree!
On the twelfth day of Christmas, the Owl Post brought to me
Twelve subjects learning,
Eleven wands a-waving,
Ten points from Gryffindor,
Nine wands a-stunning,
Eight firsties running,
Seven years at Hogwarts,
Six owls off mailing,
Five lemon drops!
Four Hogwarts Houses,
Three black work robes,
Two chocolate frogs,
And a bowtruckle in a yew tree!
* * * * * * *
The Caretaker Who Stole Christmas
(Found online (author unknown) - You’re a Mean One, Mr. Grinch)
You're a cruel one, Mr. Filch
You must not have a soul
You're as jolly as a jarvey
You're as thoughtful as a troll
Mr. Filch
You're a thin-bottomed cauldron
Filled with crusty green mold
You're an ogre, Mr. Filch
You don’t know how to love
Your mind is decked with cobwebs
Yes, you’re all of the above
Mr. Filch
I wouldn't poke you with a
Thirty-nine-and-a-half inch wand
You're a harsh one, Mr. Filch
You’re the worst I’ve ever saw
You have all the mannerisms
Of a Mackled Malaclaw,
Mr. Filch
If I had to encounter one of you, without a doubt
I'd prefer the Mackled Malaclaw
You're a foul one, Mr. Filch
You are nothing but a #$%@
You’re as bubbly as a banshee
In other words, “You suck!”
Mr. Filch
Three syllables I’d like to shout at your cat,
Though I’d probably cause discord,
Are “Cru-ci-o”
You're a meanie, Mr. Filch
You have chizpurfles in your smile
You’re nothing but a nasty
You’re sickeningly vile
Mr. Filch
Your heart is a piece of unidentifiable rubbish
Extracted from the very hub of the Forbidden forest
In a pile of Thestral dung
Oozing and goozing and gross
You offend me, Mr. Filch.
You’re eyes are dark and cold
You're as welcoming and cuddly
As a nauseous Lethifold,
Mr. Filch
You're a giant batch of Hagrid’s rock cakes
Stuffed with moldy dragon livers
Topped with Polyjuice sauce
