Cetainly somebody. Living in the Arctic may be tough, but hunter gatherers managed to do it for hundred of years post the last ice age. With no competition from existing natives some of them could travel down rivers. From there the climate get gets easier.So you would have an Americas populated by Na-Dene speakers, Inuit, and possibly Polynesians.![]()
Polynesians though? No winds and currents were ever in the right direction for them. I am not aware of any travelling beyond a line running from Hawaii to Easter