Five-fingered hands, two-toed feet, pointed ears, ridges on top of head looks like leather halter with buttons or studs, matching wristbands; unsure about the colors. Skin might be green, possibly gray. Harness is possibly orange or red. Studs are possibly yellow or gold. Skin looks warty.
Five fingers, two toes, studded vest - it's a rock troll.
See Ulik as an example:
Now Rock trolls are typically orange skinned, but they have been depicted as green on some occasions (like the image shown above).
The troll in the picture looks very similar to the rock troll king Geirrodur, although he normally wears the more regal type robes as shown below.
So I think the image is just generic rock troll.
I think this is Abomination.
Details are on the Monster Wiki