Little is known of the Draenor Giants, other than the fact that they lived on the world of Draenor. They also had two eyes, and skull resembeling an oversized human skull. They are most likely extinct, either from the destruction of Draenor, or other factors.
In Warcraft 2, the Temple of the Damned structure was supposedly constructed from the bones of these giants.
These creatures may very well be the Gronn, the lords of the ogre race. Or possibly they are the Colossi.
The Horde Player's Guide says that the ogres are one of the last race of giants of Draenor, implying that there has been more one race of giants.