Some kind of cave creature. Origin unknown, but is almost certainly a fake. One source says it is a sculpture in a cave tour.
UPDATE FROM RONDETE:
that photo of the goblin. I went to Cheddar Gorge (UK) and caves today. That
critter is in fact a sculpture in an attraction here called Crystal Quest. Just
thought you'd be interested to hear this!" – Rondette
More pictures here: http://www.rondette.com/real_goblin_that_was_photographe.htm