Hence the cowl to hide them. Note that they're still small horns. Cute small horns :DHorns and cat's eyes, on the other hand, are definitely very unusual. Even among those of Orc-ish or Ogre-ish heritage such features would be very odd.
Also, now Borgrim thinks Rosa is crazy, and actually most rightly so. Rosa still reserves her evaluation of the "local hero of sorts". At the moment, I'd think she's 50/50 on 'country bumpkin whose likely to behead himself with his sword' vs 'crazy murderous redneck'... Let's see how this evolves :)