Mr. Chatterly

From Muppet Wiki

Mr. Chatterly was the genial host of Alphabet Chat on Sesame Street. He appeared in the mid-1970s, usually holding a pipe, and then returned in Season 24, sans pipe.

Usually even-tempered, Mr. Chatterly's intellectual discussions of letters are often interrupted by animals, people or production staff wandering onto the set, forcing Chatterly to go into a rage and wondering why he can't have a sensible show.

His name is a reference to the D.H. Lawrence novel, Lady Chatterly's Lover.