Geppetto is the lonely woodcarver who builds the titular puppet in Carlo Collodi's book The Adventures of Pinocchio and wishes for it to come to life and be his son.
In the Elmo's World episode, "Noses," Geppetto appears in a "Tickle Me Land" segment in which he carves Pinocchielmo. In a nod to Pinocchio's prior appearance in a Sesame Street Newsflash, Pinocchielmo deliberately makes his nose grow by spouting a string of lies, from exaggerating his height to claiming his name is Cookie Monster. His nose grows so large it pushes Geppetto into the air, where he pleads for help. Pinocchielmo finally says that he loves Geppetto, which, being the truth, causes his adoptive father to return to the ground.