I remember reading a novel in middle school - I think the protagonist’s name was Jim. He was from a white family but he ran away to live with some American Indian tribe (this was set in the pioneer days - Little House on the Prairie sort of background). I enjoyed it immensely as a kid but I can’t remember the title at all.
Are you thinking of The Sign Of The Beaver? That’s about a 13 year old named Matt who is left to guard the homestead while his father goes to meet his mother and sister. He befriends local Indians while he’s alone.
Regards,
Shodan
Actually I finally managed to find it - it was Moccasin Trail. Thanks for the suggestions though!