Fangdam is the one with the tail (I think he's also the one without the tail, don't blame me, blame the info that's on the box) and I think it's brown because it looks like it's brown. Maybe you are right and that snake is black.
EDIT: You are right. That's not Fangdam, that's actually FangTAM. (Oh my freaking God LEGO, that is so original.)