How would you feel if your child was taught to sing "Five Little Indians" at preschool? Complete with the hand-on-mouth "wahwahwah" sound at the end?
This is in the UK, where Native Americans may be in some cases almost mythical, and "Cowboys and Indians" themed days are still common with young children.
I think it's at worst racist and at best ignorant. Personally I know a person who is from a Native American tribe who prefers the moniker Indian, and I've also known others who dislike that moniker and prefer Native American or Indigenous American or something else.
The hand-on-mouth "wahwahwah" sound/gesture is absolutely unacceptably racist, and there are dozens of variants of that song that don't involve stereotypes of any culture.Think "five little fingers", or "five little teddy bears".
Same as a hand-raised saying "How", the inaccuracies of how "teepee" is used in the western world, etc - it seems inappropriate at best.