Most common name is "Belzor." Here are some giant Belzors by Carlos Enriquez Gonzalez: http://omni-monster.blogspot.com/search?q=belzor I think Frank is also working on some.
Dang it, I'm likin' this thread but can't take a decent photo of all my green toys together. Between too-bright flash and Mr. Shakey Hand ... I'll try again tomorrow. Anyway, keep on keepin' it green folks.