Questions about Armada Slapper

I just got the Armada Dinobot 2-pack with Triceradon and Slapper. They're cool figures. A couple questions about Slapper, though:
(1) The dino head has a little red switch-like thing in its mouth. What is it for? It doesn't seem to do anything.
(2) Does Slapper have a "third form" like the other Armada Dinobots?
(1) The dino head has a little red switch-like thing in its mouth. What is it for? It doesn't seem to do anything.
(2) Does Slapper have a "third form" like the other Armada Dinobots?