Oh, yes he did...
Muppet Grover lets the f-bomb fly:
E! NEWS: Did Grover Drop an F-Bomb on Sesame Street?.
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Grover's always been a time bomb of repressed and unspent rage. It was just a question of time before he exploded in a torrent of profanity.
When I read "Muppet Grover" I thought it was a politician with an odd first name lol