Well, maybe, but I’m still skeptical. The last record of European activity on Greenland was just after 1400 and it is estimated the last settlement was abandoned mid-century because of the cooling climate. So, why would someone want to go there? The best fishing was to the southeast.
Greenland’s population was stuck there, because there are no trees to build ships; the likelihood is, they worked their way south toward other known settlements as well as they could during the daytime months, then eventually either got picked up by visitors (notice CC’s reference to English traders from Bristol who plied their wares in Greenland) or they died out.