I’d also like to add, not from Duolingo, but from the MHA Language project, there’s a Hidatsa learning app, for the endangered Dakotan language. It’s really nice and has pictures and the words are pretty and it makes you spell.
Mango, another language learning app (you gotta have a library card and a participating library tho), has Cherokee as well! (They don’t have Navajo yet, but they do have Hawaiian)
Urocyon's Jaunts 2.0 
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