Steve the Chameleon

Why not Steve as an agent?
Good morning Agent P.

There is a misson for us and you to do. We have to make Steve the Chameleon into Agent S,

And you have to stop the Doof. Monagram out.

Gigantic Dino?
In the episode Lizard Whisperer when Doofenshmirtz's invention zaps Steve the Chameleon he turns Gigantic and people think he is a dinosaur.

This is truely untrue so this is a BIG question mark (?).