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.
 Sgt_Spanky
                                                
                                                Level 8
                                                Dec 28, 2018
                                            
                                                
                                                    Sgt_Spanky
                                                
                                                Level 8
                                                Dec 28, 2018                                            
                                        When I read "Muppet Grover" I thought it was a politician with an odd first name lol
 Piece2YourPuzzle
                                                
                                                Level 8
                                                Dec 28, 2018
                                            
                                                
                                                    Piece2YourPuzzle
                                                
                                                Level 8
                                                Dec 28, 2018