From Muppet Wiki

Tom, Dick, and Harry are also collectively known as the Three-Headed Monster. They had a major role in episode 119 of The Muppet Show and made brief appearances in episode 120, where Kermit mentioned their names ("I can't have every Tom, Dick, and Harry walking backstage. Hi, Tom. Hi, Dick. Hi, Harry.")

Facts

• Dick is the female of the group. When asked which of them is the leader, Tom looks to his left (to Dick and Harry), saying "He is." Dick looks to her right, to Tom, saying "He is." Harry, looking at his right, to Dick, says "She is."