Ginger's advice is good, but please post pictures. If there is a problem with the little one's back legs visually then it could be any number of problems which are serious, but it's hard to diagnose if we can't see what it looks like.
Other than that, how long have to had the frogs? Some just take longer than others to acclimate, maybe your timid one is just more frightened than the other and needs time to adjust. Try to keep them in a quiet, dark room, make sure you have the right heating requirements, and just have them in a quiet calm environment for a little while. I covered the sides of my baby White's and now my P. Tomopterna's viv to make them feel more comfortable and safe. If there are no signs visually of the a problem with it's legs, then it could just be stressed out and needs time. Just test out some of these methods and see if they work, otherwise posting pictures would be the best thing you could do, maybe even video if you can do that, so experts can see how he moves.
I hope our info helps you, it's always sad to see a little frog in need. ):





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He did some tests and said that my frog had 'Dropsy'. He told me there was nothing I could have done, but I still feel terrible.
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