If you stuck around for the Black Panther end-credits scene you saw Captain America’s old war-buddy-turned-frenemy, Bucky Barnes, emerge from that hut in Wakanda.
The kids in Wakanda call Bucky “The White Wolf.”
Most likely, this “White Wolf” reference in Black Panther was a nod to comic fans: Bucky is, after all, a white dude who was more or less “adopted” by Wakanda and as we’ve seen in the Infinity War spots, a man who will defend the kingdom.
In the comics T’Chaka adopted a white child named hunter, a kid whose parents died in a plane crash in Wakanda.