Well, you could always capture a village that doesn't belong to the Ferons so that you can produce non-Feron troops. And you don't really have to LOOK like them, either. Infact, you have to fork over a tonne of cash before you get a furry hide of your own.
Don't see why you'd want to, though. The Feron are awesome infantrymen - their armor is moot, but that just makes them all the faster, and their two handed axes can chew through pretty much any foe.