You do realize that:
A) America (and Canada) comprise of a lot more terrain types/regions than the plains.
B) Assorted tribes lived in all of them. And still do.
Yes. Simply put - the Native Americans
are not a single culture with a unified pantheon. There are several different traditions and belief systems among them.
Neither all Norse Gods were Asguardians; Loki, Frey and Freya, to name a few, were not.
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So you are right, they are not accurate, but I don't think this automatically disqualify them as names for real-world mythology-inspired pantheons.
Not equivalent. Yes, among the Norse gods there were Aesir and Vanir and other groups. But all of those characters spent time in Asgard, interacted, and knew each others names, and appear in the same stories. The collection of gods at least wound up as the pantheon of what we can (at least roughly) call one religious tradition. Call him Odin, Wotan, Grimnir, or one of several other names, there's a period where most of the Norse people recognized the same basic entity, with fairly similar stories and religious traditions relating to him across a largish area.
The same is *not* true for "Native American". It isn't one culture or religious tradition. Doing this to the Native American traditions would be rather like lumping the Celtic, Norse, and Greek gods all into one group, and calling it the "European Pantheon", lumping the Chinese and Japanese together into an "Asian" pantheon, and so on.
There are at least five different cultural groups of Native Americans in the USA alone - roughly the American Northwest, Southwest, Midwest, Northeast, and Southeast that have mythological differences between them comparable to the difference between, say, the "Celtic" and "Norse" gods. The number of groups gets larger as you include Canada and Meso-America and South America.