Yes the Stone Dwarves are also called Earthen. That term is clearly coined not by the Titans but the Dwarves.
Since the Iron Dwarves were called Iron Dwarves by the Titans, it is reasonable that they would have used similar naming practices with Earthen. Hell they could have been called Earthen Dwarves back then. I used the most apt description as the exact term is not as well defined.
And until we actually meet a titan, it's all basic guess work based on the lore that came out of one dungeon and Wrath.