I third TSF's descriptions! (And if the Lion does call them "Savage Bunnies", then that's what they should be labeled as.)
P.S.: I happened to get a copy of show #4100, and here's some new characters:
During the street scenes, two grouches sang a song about "What Happens Next". They probably shouldn't be included since they are just two random grouch characters, and have been used many times before. (Originally from TAOEIG.)
THE POGO STICK--from "Elmo's World: Jumping"; a green, yellow, gray, and white pogo stick played by John Kennedy. He has lidless eyes on the top center of him and a ventriloquist's dummy-like mouth.
These are the only two "new" additions from the episode.