The one on the left has a base color of Scaly Green. I then drybrushed him with a mixture of Scaly Green and Scorpion Green, and finally a light drybrush with pure Scorpion Green. Gums are a mixture of Blood Red and Bestial Brown, and the teeth and "toenails" are Snakebite Leather. Tips of the eyestalks are Bad Moon Yellow.
The one on the right has a base of Scorpion Green, then a drybrush of Vile Green and Bad Moon Yellow, and then a light drybrush with Bad Moon Yellow. Gums, teeth, and toenails are just like the other one. It also has a wash of dark green inkto make the cracks between its lumpy fleshy bits stand out better.