I have this figure and I really love him. He's labelled as a Dragon Mutant by the company that makes him (Papo) but I think he looks far more like a Lizardfolk warrior or in this case a Lizardman.
@Scalenex posted a thread
here where someone painted and converted one of these up as a giant Saurus Warrior and used him as a Dread Saurian, which is a great way to save oodles of cash and actually looks more like the original Monstrous Arcanum artwork than the actual GW model. I'm not sure GW would appreciate it though as they're apparently pretty sniffy about using non-GW minis in GW events. Anyway, a great way to convert the biggest Lizardmen monster in the game.