They use their mouths where we use hands and where we use mouths they use hands. Let me explain:
A Ngobe signals with their mouth. They make a big pouting expression as if to blow you a kiss then make a head gesture. The first time you see the pout, a Westerner would assume they are being indecently propositioned, but it is not so.
A big pout followed by a right movement of the head means - over there to the right. A big pout followed by a shake of the head means, No more. And these gestures are many and not intuitive.
There is no shouting that I have ever heard. There is a very loud sound, a yodeling call. Something between a fog horn and a bird call that is used to alert 'the tribe'. On the coffee farm, it usually means 'the chief' (me) is coming'.
If there is a disagreement, a serious conflict, it is not argued, it is fought with bare hands. They use knives and it is ugly and violent. It is a Ngobe thing, the rest of us are never involved.
So, when we use hands they use their mouth and vica versa.......this world is a wonderful and strange thing.