This strange creature is a Chabra and featured in a home grown campaign written and run by my good friend Peter Greenaway (no, not the director). The Chabra were one of his best creations and were his worlds equivalent to Goblinoids in other traditional settings. The Chabra were the weakest of the types encountered but they were not to be underestimated in combat.
I made this model from an old Games Workshop plastic goblin. It didn't take much conversion work to fit an extra set of arms on this model and I was quite happy with the way it looked when finished.