The springcroc is not a Furahan but an Eponan animal. Parts of the vast Epona material have reappeared on the web, and the many life forms discussed there include the springcroc. You will find it right here. Regular followers of this blog will now that I have discussed it before (first here, and then here and afterwards here), and I will probably come back to it in the future (I was one of the people who used to work on it, so that's why).
The thing to remember about Eponan terrestrial life forms is that they left the sea fairly recently, so adaptations to a land-based existence have not yet reached optimal solutions yet. That holds for Eponan trees, whose stems have not yet evolved anything as suitable as wood, and it may also hold for the springcroc. Its general design is very nice: in essence a springcroc is just a large stomach enclosed by two half shells. It lies in waiting in some swamp, and when a suitable prey arrives in striking distance the springcroc catapults itself towards the prey using its own froglike leg. The prey is engulfed by the stomach and is slowly digested. Simple, but simple solutions work.
This is the springcroc as shown on the Epona site. Steven Hanly, one of the people involved in the Epona project, produced many 3D Epona images at the time, many of which can be seen on his web page. For this purpose he had also built a 3D springcroc computer model. A few months ago he sent me his 'obj' file to have a look at. I was also trying out ZBrush, a 3D 'sculpting' program that is extremely well-suited to produce organic looking animal shapes. I imported the springcroc shape, and used it to try out some embellishments, as ZBrush allows you to push and pull at objects at will. As you will see this ability is the reason why the poor animal now has so many bumps on its head.
I also decided to 'bodybuild' its musculature somewhat. With just one leg it must be difficult for the springcroc to control the direction of its jump in a lateral direction. While a jump in the general direction of the prey can work for extremely slow prey animals, a jump with some more precision should help the springcroc to rise to the pinnacle of the food chain (or at least to stay in plaavce with more ease). The only way the springcroc can exert lateral control is by pushing harder or less hard on either of its two toes while jumping, so these are fairly wide apart. For similar reasons the joints between the segments of its leg were broadened: to provide more joint stability as well as a bit more control.
Having done that, I exported the model again, and after some trouble loaded it into Vue Infinite, where I embedded it in a meadow-like environment of Eponan plant (well, actually one plant was designed for Furaha, but these images are sketches, nothing more). The springcroc should really be coloured a bit more interestingly, but this is just a work in progress. The white leaves reminded me of springtime, so there you have it: a springcroc in springtime...