In "He's Too Sexy for His Fat" (Season 2, episode 17), a throwaway scene shows a group of parka-clad Eskimos saying good-bye to a youth on an ice floe. They have harpoons and there are igloos in the background. The young Eskimo says he's headed to Hollywood, where he'll get plastic surgery and become a star. His name is "Jennifer Love Hewitt." (In other words, Hewitt the actress was once a male Eskimo.)
In "Blind Ambition" (Season 4, episode 3), a throwaway scene has Cleveland auctioning a Comanche headdress at Sotheby's. It's apparently an Indian auction because a pottery bowl, a canoe, and a totem pole are on display.
In "Stewie Loves Lois" (Season 5, episode 1), a throwaway scene presents an Indian version of What's Happening? Two black guys in loincloths stand in front of teepees, talk slowly, and say "How."
The first and third bits are stereotypical. They reinforce existing stereotypes and don't do anything to counteract them. The second bit is neutral. The mixing of artifacts from different cultures makes sense since it's an auction.
For more on the subject, see Indians in Family Guy.