Ice-river clans

The Ice-river clans are a distinct sub-group of the Free Folk.

Season 3
The Ice-river clans now march in the army of King-Beyond-the-Wall, Mance Rayder, who has united all of the different wildling clans to assault the Wall and force their passage to the south. Mance points out that the Hornfoots hate the Ice-river clans.

In the books
In the A Song of Ice and Fire novels, the Ice-river clans are fierce cannibals from the distant fringes of the lands beyond the Wall.