A few problems with this:
Give Bob's Burgers one point for trying to include Native lore at all, but take away the point for botching it. I'd say no school, whether real or fictional, should ask students to make sacred objects from Indian cultures. It fosters the illusion that these cultures are superficial and easily knowable.
For similar examples of people dressing as Indians, see Umatilla Model Portrays Pocahontas and Stereotypical Yulefest Postcard.