Pirahas hum, sing, whistle, yell, and speak their language. Oh yes, the men whistle conversation when they hunt in the jungle. Go ahead gentlemen, whistle the words to a Robert Frost poem.
And for grammar snobs — no past or future tense, no recursion; that is, no relative clauses, ever. You will not find a phrase within a phrase. Sorry, Chomsky, nope. Now, concerning the words for Enemy and Friend.