His name is Cobal. He is a member of
Cobal is one of the first Mogma that Link encounters in Eldin Volcano. He is later found nearby the Earth Temple, where Link overhears a conversation between Cobal and his treasure hunting partner, Ledd, about the broken key required to enter the temple.
As many Mogmas' names are derived from minerals, it is likely that Cobal comes from the element Cobalt.