"Grouchelot" is a loose parody of the very famous but fictional place Camelot. A Sesame Street song that's sung bu Oscar the Grouch with Grundgetta, Stephen J. Grouch & Telly Monster describes the location with very grouchy details.
Oscar the Grouch tells the story of King Complainsalot & the Knights of the Broken Table to Telly & the Grouchketeers. In the story, Telly plays a monster (Worriesalot) who wants to join King Complainsalot's (Oscar) band of Grouches known as the Knights of the Broken Table. But 1st, he must pass 3 tests, including singing a song with Grundgetta & finding the Holy Pail. Finally, they all sing an ode to Grouchelot.