This is a prototype of a ReSaurus line 2 figure.
The main difference you can spot here is that the figures have visible hinge dots. The final figures on this line used color-matched plastic in the hinges so the dots are a texture, not a color difference. 

In the gallary is yet ANOTHER prototype of this figure! Look at the differences here, huuuge eyes, much straighter legs, and the strap across the 'boot' is white instead of black. The body also appears to be a slightly different shape or paint style. It is strange how many they made!