Feel free to disagree (if you enjoy being wrong).
5. Heat Miser. The song, the hair.
4. Sir 1023. Odds bodkins. O.M. the caveman is an honorable mention. Yes? No? Yes!
3. Yukon Cornelius.
2. Kubla & Dummy. “Dummy, who do you like best? Me, or Jack Frost?” “You, Kubla. He has cold fingers.”
1. Bumble/Abominable Snowman. Alternately terrifying and cuddly. Great range for a sock puppet.
Strangely there is no mention in Wikipedia of Romeo Muller, the guy who wrote these screenplays, many of which are quite clever. Neither does the Jack Frost writeup mention the bad guy. I gotta fix that. Yeesh, these lazy social media types.