Stinkfoot is a monster seen in the episode, Girly Squirrely, who lives in a park named after him, on a mountain also named after him. He's seen as a myth, but is revealed to actually live there.
Stinkfoot is a parody of Bigfoot, a real life legend based on a supernatural creature that lives in the wilderness. He lives in a cave on Mount Stinkfoot, at Stinkfoot National Forest.
Stinkfoot looks really similar to Bigfoot, but with a lighter shade of fur. Instead of brown, his fur is somewhat mauve. He seems to have a taller head than Bigfoot, and has larger, dirtier and hairier feet.
Stinkfoot appears near the end of Girly Squirrely, appearing at where the Squirrel Scouts were camped, kidnapping Chloe and then running away.
Timmy tells Mr. Turner and the rest of the Scouts that they have to go save her, but when they go to his cave, they realise that she was safe, and that Stinkfoot only wanted their smores.