Been told they reversed the names to discourage the tourists. Greenland is really "Ice"land, and Iceland is really "Green"land.
Any truth to this rumour?
Probably as much truth as to any other 1000 year old story. The story is that Erik the Red was expelled from Iceland and came to Greenland. He named it Greenland to make it sound more attractive to settlers. I am not sure tourism was strong at the time, since it was the year of 982