Creepy!

So smallest an earliest observed stage of trollkin life is a Goblin. These are small humanoids, described as twisted version of a gnome or a halfling. They are light, fast and crafty, the only actual crafters in entirety of a species. Goblins are also cowardly and frail, which means they fight dirty - ranged weapons, ambushes, poisons and traps, never striking if not outnumbering enemy. There were instances of people trying to adopt goblins into society though it inevitably leads to violence and aggression - which seems to be connected with trollkin growth and development.

Arcane born mutated farm animal-human hybrids!?! Count me in! 😁

Capros - most numerous goat-hornfolk. They are smallest but fastest of them. They can sustain themselves on almost anything, eating any plant and animal matter they can find. They are very agile, able to jump in ways which seem impossible, pioneering in places you wouldn't suspect them to survive. They have very varied types of horns - from small barely visible through the fur to long, sharp, deadly tools. Prefer small weapons like knives and sharpened stones or long ones in type of spears or even sharpened sticks. In the wild they don't seem to be very industrious - no one found any tools they would made and any shelter is usually simplest caves and burrows.

I can certainly see why. I would like to present them not only as creative tools and unspeakable dangers but also as a dungeon features. Imagine your players know about floating disks and then bump into invisible wall in a dungeon. Strong enough impact or a little bit of daylight may let them get into this secure area but what hides there? Or they encounter invisible platforms allowing to get in unusual place - why would these disk were set like this? Do they lead to a trap or something sinister up there? Or maybe it is clever shortcut of some smart magic user?