Half-troll (NPC)

The Half-trolls are a race of Troll-folk from Far Harad. They are in Public Beta 22. They will spawn in the Pertorogwaith biome. Little is known about these mobs yet, as the only information released about them is the picture below.

As there is a Half-trolls faction, it is reasonable to assume that the Half-trolls will have their own crafting table, banner, achievements, armour and weapons, structures, traders and hireable units.

Lore
In The Lord of the Rings: The Return of the King, the Half-trolls are mentioned only very briefly, and are described as "black men like half-trolls with white eyes and red tongues". It is unclear whether this was intended to refer to an actual race of Troll-creatures, or was just a Númenoréan perspective on the men of Far Harad.

The Half-trolls of the mod are presumably a crossbreed between Trolls and either Orcs, Men or both.

Warrior Variant
Half-trolls have a warrior variant called Half-troll Warrior. They wear Half-troll armour.

Size Comparison
As you can see in the image, Half-trolls appear to be quite a bit larger than Orcs. This suggests that Half-trolls will be taller than the player.