FRAZZLE:
Frazzle first appeared on Sesame Street in 1971 (season 3). It was in a Guy Smiley game show sketch called "Beat the Time." Apparently, unlike other Muppet monsters, Frazzle was meant to be scary, which led to less frequent appearances in the spotlight between the 80s and 90s because of his
Frazzle had his own language that sounded like some strange monster gibberish that he was known for. It wasn't until a sketch in 1993 that we hear him speak as he tries to check into the Furry Arms Hotel.
hope this helps.