Kappas and shelfae on the coastal cliffs. Lesser red orcs there too.
Manticores and thraks on the mine road.
Greater orcs on the way to Solhaven. Gnolls, forest trolls and ogres also along there when you get a little tougher.
If you take a look at the KP page for the critter you are hunting, you get links for those of similar level at the bottom of the page.
http://www.krakiipedia.org/wiki/Greater_burrow_orc