And they had no base nearby to launch from. Go back home and stock up? Noo.. home was Greenland, there's no riches there, and they went to Vinland to try to stock up.

Greenland wasn't a frozen wasteland back then. The climate was warmer. Climate change is a large part of what drove the Norse out of Greenland.

Wasn’t this during the Little Ice Age?

It was no paradise