Actually no! The internal names, in the code, don't make much sense as we named them before they even had a design or sprite. Here they are, (it's not their "official" names):
hedgehog, hedgehogbuff, juggernaut, warm (typo of worm), tourelle (turret in french), explosive_barrel, and boss.
I'll let you guess which one is which :P I think it's more fun if you come up with your own names!