kengr

Dr Demento has several Christmas albums.

Dr. Demento Holidays in Dementia
Dr. Demento Presents The Greatest
Christmas Novelty CD of All Time
Greatest Novelty Records Of All Time - Christmas

And Bob Rivers has done *way* too many parody songs. Here are some of his albums:

I Am Santa Claus
Chipmunks Roasting On An Open Fire
White Trash Christmas
Twisted Christmas
More Twisted Christmas
An X-Rated Christmas
Lost Holiday Songs

I also have things like:

Elves Gone Wild by Robert Lund
Codependent Christmas by The Therapy Girls
Here's Your Christmas Album by Bill Engvall
Christmas Turkey
Aussie Christmas by Bucko & Champs (That's where I first ran into "Santa Never Made It to Darwin")
Have Yourself a Scary Little Christmas by The Cryptkeeper
Bah! Humbug! Christmas Songs For Grouch & Grinch
Dr. Elmo's Twisted Christmas
Christmas Comedy Classics