Don't Sit Under the Pistachio Tree

From Muppet Wiki

"Don't Sit Under the Pistachio Tree" is one of several songs sung by Earl Sinclair, Charlene Sinclair and Roy Hess, as "The Sinclair Sisters," while they entertain the Pangaean troops in the Dinosaurs episode Nuts to War (part 2).

This song is a take-off of the Andrews Sisters song, "Don't Sit Under the Apple Tree".