Yes Iceland is mostly green and Greenland is mostly ice, but their name origins are not quite the way you were taught. The origin of Iceland's name isn't 100% known, but it's commonly accepted that a viking named Flóki landed in Iceland during the winter, and because winter usually brings snow, the name Iceland was innocently born. Flóki wasn't too impressed with Iceland and sort of wrote it off as worthless. He didn't even know Greenland existed at the time. No one really did for another 100 years until Erik the Red, another viking, started telling everyone about this magical place called Greenland. Erik had been banish from Iceland for 3 years for being a jerk and was trying to stick it to everyone when he returned from exile. So, it's true Greenland was meant to throw settlers off, but Iceland was almost the opposite. Flóki was trying to save people from Iceland.