Goblin
Whether a mountain goblin, a water goblin, or a field goblin, this species is resilient, clever, and generally good humored. Unfortunately, being significantly smaller and physically weaker than the other races, as well as historically under-privileged, there is often little recourse for a goblin pushed past the bounds of their good nature, save a good deal of cursing and shouting, or a little good old-fashioned sabotage.
Basic Information
Anatomy
Goblins are small compared to the other sentient races, with mottled and often bumpy skin. They have round, almost owl-like faces, long, bumpy noses, and pointed ears. Their limbs are quite long for their height, and they have short, stumpy tails, though they almost universally keep them covered. There are three distinct "types" of goblin:
Water Goblins
Water goblins are a little under shoulder-high to an average human, tend to be quite fat, have webbed fingers and toes, and blue-green skin. Their eyes are particularly large and black, and their ears are smaller than the other types.
Field Goblins
Field goblins are closer to waist-height, more stout and muscular compared to other goblins (though they still can't match a human of similar age and inclination for strength), and have particularly knotted brown skin. They have oversized ears and brown eyes.
Mountain Goblins
Mountain goblins are the shortest, often only thigh-high to a human, and generally scrawny. They have green skin, ranging in shade to nearly black, sharp teeth, and their eyes range from brown to black.
Growth Rate & Stages
Goblin children hatch with long tails and webbing even to the tips of their fingers and toes. They "grow into" these traits as they age, both tail and webbing remaining the same size while the rest of the body grows (except in water goblins, who keep their webbing). Then, during puberty, the webbing and about two-thirds of the tail dry up and fall off.
Dietary Needs and Habits
Goblins are primarily vegetarian by nature, though most eat a small amount of fish and a large number of insects as well.
Additional Information
Perception and Sensory Capabilities
Goblins can hear and see very sharply, even in low light. Their taste, however, is notoriously bad: "like fine cake to a goblin," is a common phrase, referencing how goblins can tell little, if any, difference between fine cake and stale bread.
Civilization and Culture
Naming Traditions
Goblin names vary widely between the types, from region to region, and even between families. They may coopt names common to another species, make up something to have a pleasing sound, or name their children after animals, but the most common trend is to name themselves after concepts--and often lofty ones.
I love that there are different varieties or "subspecies" of goblins. The description you paint of them is also great—very unique physical appearance from the other races. And tails! "Like fine cake to a goblin." *chef kiss* Amazing idiom. This goes so well with your goblin sheep, too.
Can't have goblin sheep without goblins! Thank you :D