Sorry, I was away for a bit. (the homework? I've been done for like a week!)
Concerning the fury of the tiki, there's some problems. First of all, 3d animation is not like 2d anim. In 2d, it's easy to make something blink or open it's mouth. But in 3d, it's a real pain (and I admit, I can't do it) The thing is, the mouth, eyes, and stuff is all in the texture, not the model. (Reduces size, poly count, and makes everything easier (and possible))
Rather than opening it's mouth to attack, how about it slightly 'lunges' forward, as if trying to come out of the earth? I'm sorry, but blinking and opening its mouth is a little much for 3d. Opening its mouth in a model of this style would stretch it (I think, I don't know, since its a bit too complex) a mouth like the dragon has is easy, but the FOT is a little tough for that.
How about I upload an example when I get back to school for you to judge? (and I'll test the .zip to make sure it works)