Just onna go out onlimb and assume that that's not Stickman. I mean, if you take his name literally, and use the concept art as a basis, that beast would be far too thick. That thing's as much a "stickman" as Ahnuld.
Although I'm not saying that it "absolutely" isn't Stickman, I'm just saying that from my perspective, that's not a stickman.
Pretty cool design though.