Not that I can tell you anything on the item, as I'm about as pottery stupid as a person can get. But some context or information on it would help those in the know.
Like, where found (State, region, cave, river, etc), when found (Yesterday, 50 years ago), how found (A dig, or just an eye ball find), found or bought, etc. Again this type of information goes along way in helping people ID items.
Plus are asking if it is Indian, or are you saying it Is Indian, and are you wanting to narrow it to a tribe etc.
This is not meant as a lecture mind you, just giving you some pointers to help you get the ID you are looking for. Good luck and I hope get some of the answers you seek.