from: http://maptd.com/what-would-greenland-look-like-without-the-icecap/
“The Greenland ice sheet covers 80% of the island with a thickness of generally more than 2 km. If the entire ice cap melted it would cause a global rise in sea levels of 7.2 metres, dramatically affecting coastal regions around the world, but what would the island of Greenland itself look like ?”
And in answer to the last question - more like an archipelego than an island (picture at the link).