I was just reading the guide to the Connie Stevens episode and came across the name "Bruce Fox". I think I know who that might be. He appeared in At The Dance doing the "Fox Trot". He had a thin frame, face, brown fur, and beady eyes. Why didn't he appear other times in the show? After that he just seemed to have disappeared.
Welcome to the Muppet Central Forum!
Sesame Street Classics on YouTube
Sesame Street debuts on Netflix
Back to the Rock Season 2
Sam and Friends Book
Jim Henson Idea Man
Bear arrives on Disney+