Admiralty Miniatures produces 15mm and 28mm miniatures, focussing mainly on Chaos Dwarfs and the Fauna of their environment. Like most Chaos Dwarfs those need slaves though and in conclusion Admiralty Miniatures offers some Slave Orc Heads and two Hobgoblin Slavedrivers.
12 of those Slave Orc Heads or 2 Hobgoblins cost £8 per pack. Those are available in Admiralty Miniatures Etsy store. I can’t recommend you Admiralty Miniatures Facebook page enough, where you can find some other greens not available in the shop, some pictures of miniatures that use the Slave Orc heads and some sculpting tutorials. All pictures shown belong to Admiralty Miniatures.