I've read of western movies that used locals in them to speak in their language.
They managed to insult a LOT of the 'cow'boys and stuff.
It must be a real hoot to understand the laughing in the theaters coming from NA's.
https://medium.com/dose/youll-never-believe-what-native-american-actors-in-westerns-were-really-saying-d87496f3d1ab