The sagas say the Leif Ericksson named Greenland because the name his father had given to Iceland discouraged settlers from Norway. Only rudimentary agriculture was possible on Greenland, even in those days. The Greenland settlements died out after about a century.
It was Erik the Red who named Greenland that, for the reason given. The Greenland settlements lasted more than a century—seem to have disappeared in the 1400s.