It's Aztec. Mel Gibson's Apocalypto is a very accurate portrayal of what the Aztecs were up to.
Some of the imports sneaking over the border still speak Nahuatl and not spanish- that's the old Aztec tongue. And that's not the only quaint Aztec custom they keep alive.
It was Mayan. Why I know is that they used to think Mayans were so much more civil and “nice” than Aztecs but then some shocking digs produced proof that they were as vicious and demonic as the Aztecs, if not even worse. Aztecs, pulling hearts out and inhumane tortures and child sacrifice, were completely satanic. No redeeming qualities like a few American Indian tribes on the East Coast..
Shocking cultures as were many in the uncivilized worlds. Thank goodness for the Christian missionaries who had a little effect until the evil “Liberation Theology” (Marxists) took over the Catholic Church to destroy any progress that had been made.