Is there real evidence of pre-Columbian African contact with South America?

[Tulius]

With North America for sure [Vikings reached it]. With South America it's more difficult, even if ... not Europeans, but Polynesians could have reached the American continent before of Columbus [meaning South America].

But as far as I know even if the Polynesians were quite “near” (in Easter Island), there is no real evidence of their presence in South America. Albeit some chicken bones were already discussed.

For me it seemed that “real evidence” was central in the Op’s question; besides the African part, after all we are in the African History sub-forum.