In my job a spend a lot of time on the phone with people from the Rez (mostly in New Mexico but some in WY and MT.) The Indians I talk to do have a distinctive way of talking but that ain't it.
And AFAIK Mennonites don't shun technology the way Amish do. I don't even think the Rumspringa is a Mennonite tradition, pretty sure that's an Amish thing.