In Preparation For His Portrayal As Tonto, Depp Studied a Little-known Native American Language.
Johnny Depp, who plays Tonto, put in a lot of work learning the Comanche language so that he could deliver a more authentic performance. The Comanche people are the only people who have ever spoken the Comanche language in its natural environment. If you are going to take part in something, you might as well give it the greatest effort you’ve got in order to get the most out of it.
A linguist who specialises in dialects named Todd McDaniels was quite impressed with the actor’s portrayal and gave him excellent marks for it. The words were present, but the speaker’s pronunciation was choppy while still being appropriate to the situation. The following is what McDaniels is reportedly quoted as saying about Depp, according to the material found on IMDb.