Grover first recites a long poem about frogs, which introduces various Kermit the Frog segments from Sesame Street, while being interrupted by the Three Little Pigs, who are there because Kermit ...

But Lord Grover ... the Muppets on Sesame Street, you're right: it's just one of the many pop culture references that author George R.R. Martin slipped into his Song of Ice and Fire series ...