Frór
From Tolkien Gateway
Frór was a dwarf of the line of Durin, who was killed with his father Dáin I by a cold-drake in the Grey Mountains.
The kingship of Durin's folk clan then passed on to his brother Thrór, who founded the kingdom of Erebor. However the greater part of Durin's folk followed Frór and Thrór's younger brother Grór to the Iron Hills.