The Cherokee have a story about giants who arrived from the west and stayed with them for a while, then returned to the west. They were said to have slanted eyes. I think I read about this in one of James Mooney's books. Maybe they were from Asia or were a different species from us.
The Paiute have legends of a race of red haired giants who were cannibals. Here's a link:
Oversized skulls from a cave in Humboldt County, Nevada were taken to Humboldt Museum. They are not on exhibit, but you can ask to see them in a back room. A link to the museum: [www.atlasobscura.com]
The website opens with a photo of a woolly mammoth skeleton, but scroll to the right and you can see the skulls.
I don't know what coin they have included for scale in the photo, so I can't really say much about them.
Also, while I'm thinking of it, there are also over sized human skulls on display in a museum in Peru. I think it's the same museum that the Paracus elongated skulls are in. National Museum of Archaeology, Anthropology, and History in Lima, maybe?
Also, a Choctaw legend.
Mississippi as a Province, Territory and State
by J.F.H. Claiborne 1880
The Choctaws preserve a dim tradition that, after crossing the Mississippi, they met a race of men whom they called the Na-hon-lo, tall in stature and of fair complexion, who had emigrated from the sunrise. They had once been a mighty people, but were then few in number, and soon disappeared after the incoming of the Choctaws. This race of men were, according to tradition, tillers of the soil and peaceable. There had like wise been a race of cannibals, who feasted on the bodies of their enemies. They, too were giants, and utilized the mammoth as their burden bearers. They kept them closely herded, and as they devoured everything and broke down the forest, this was the origin of prairies.
9 footer found in a Pennsylvania burial mound. There appears to a crude photo or print, but not sure of scale.