The Deerpig or Babirusha is a rarely thought of pig species, but there are two different Safari/BBI/Schleich/Papo figures for it and I think it'd look cooler than a warthog for a pig faced orc mount, or a Hellpig...  for one thing, they are agressive, and if they don't use the upper incisor tusks enough, they will grow INTO THE SKULL...and that's pretty orcish to me.