The New Adventures of Winnie the Pooh S01 E35 The Old SwitcheRoo

Roo asks Tigger to keep him from having a bath, and the tiger recruits Piglet to switch places with Roo to trick Kanga. But when Roo and Tigger get excessively dirty, and Kanga pretends that she does not recognize Piglet, everyone realizes that their attempted "switcheroo" has gone too far.