How about bring this unit back?


Giant Rat ?
image (Size of a Slave Rat/Dogs)

Or Wolf Rat

(Size of Wolf)

Maybe even BroodHorror (Giant Giant Rat)


Only if they are mounts to other units, like the warg riders from lord of the rings, if you kill the mount the rider switches to a ground unit, if you kill the rider the mount becomes like a bull on the loose that could drag players by their feet for a short distance.