Little is known about the giants of Draenor, other than the facts that they lived on the world of Draenor and were of giant size. Its skeleton is human-like but very, very big (the size of a building or larger as seen in Warcraft II, Warcraft III, and World of Warcraft).
Information from BlizzCon 2013, indicated that the giants of draenor may have been related to gronn and ogres. From concept art, these giants may be really big gronn.
The bones of these giants can be seen forming the Thunderlord clan's city of Grom'gar at Colossal's Fall and the Bones of Agurak lying in the desolation of Agurak's Fall. They are found in central region and at the eastern edge of Frostfire Ridge.