Rockmobile is one of the mutant toys in Toy Story. He is the head of a praying mantis or fly stuck on the (presumably) legless body of an action figure which is stuck in the headless and legless torso of a Rocky Gibraltar toy with a steering wheel in it. The praying mantis-headed figure can drive the body around using the arms to walk on. In Toy Story he can be seen, when the mutant toys are first shown, with the Walking Car, Legs, and Ducky retrieving parts of Janie Pterodactyl.

Trivia

Rockmobile is similar to Twitch in Toy Story 3