When you mentioned dwarves/squats I was thinking "I'm out" but those helmeted heads might work with Terminator armor/torsos for a modified Terran grunt look.
I must stress I haven't seen them in the flesh, but you could combine the torso, arms and head with some taller legs, if you could find suitable ones, or use the old "truescaling" method of inserting some plastic slices at strategic joints to beef them up.
That said, given GWs scale creep over the years, the figures might even be tall enough to work next to other suppliers' ranges.
