The Grouchketeers are a group of real kids dressed in costumes based on their leader, Oscar the Grouch. Oscar depends on them to help him demonstrate things to the viewer (such as a game of "Three of These Things"), help him make things trashy or noisy, and sometimes even find him some more trash. Telly was also a long-time Grouchketeer after having been inducted in Episode 1566.
One of the group's earliest meetings was held in Episode 1118 for the purpose of "making little grouches a little smarter". Oscar had previously referred to a gathering of kids as his "grouch club" in Episode 1041.
An appearance in Episode 1952 featured Grundgetta leading a Grouchketeer meeting and playing "Cross it Out." Grundgetta calls the kids up and asks them to cross out a different thing on her card. David calls her out on something; the kids are good at crossing things out, but she's done nothing. She gets the card and crosses the whole thing out.
The club was last featured during season 38.
- "Doin' the Grouch"
- "The No-No-No!"
- "A Very Unhappy Birthday (To You)"
- "Grouch Come Out"
- "Grouch Melody"
- "Honk, Bang, Whistle and Crash"
- "Mud! Mud! Mud!"
- "My Grouch Family"
- "Oscar's Do Re Mi"
- "Oscar's Trashtime Band"
- "There's a Big Heap of Trash at the End of the Rainbow"
- "You've Got to Learn How to Wiggle"