Grok

Grok is a giant that can be found roaming the far-western part of the tundra in central skyrim and just south of Rorikstead. Unlike most giants, Grok wont become hostile when approched but no interaction with him is available. He drops standard loot for a giant.

Given that he is alone and far from any other giant camps it can be asumed that Grok is some sort of outcast or is involved in some particular quest.