I think I've never seen a female dwarf rogue. Female troll rogues are pretty stealthy as well. And still looking for tauren rogues (they're too good at cowmooflage).
But I have seen female tauren and troll warriors. Also I have female troll shaman and female draenei warrior :R (if they're supposed to be rare) I had a female troll rogue too but deleted it already (never leveled it higher than to level 6 :P)