The Empire of Thonia - Havard's Version

[Havard]

Beastmen Races (Beastmen, Orcs, Half-Orcs, Goblinoids)
Believed to originate in the far north, these races are only known in the northernmost provinces. Trolls, Ogres and Giants are much more common, as are Undead.

If we accept this part about the Beastmen races, what would we substitute as enemies for lower level campaigns?

-Havard