Little is known about the giants of Draenor, other than the fact that they lived on the world of Draenor. They also had two eyes, and its skeleton is human-like but very big (Warcraft II, Warcraft III, World of Warcraft).
Temple of the DamnedThis section concerns content exclusive to Warcraft II.
In Warcraft RPGThis section concerns content exclusive to the Warcraft RPG, and thus unlikely to be canon.
Horde Player's Guide says that the ogres are one of the last races of Draenor's giants, implying that there has been more than one race of giants that have lived on Draenor.