I'm glad to hear that your frog is doing better. If the frog is older it might take a long time to recover or it might not recover. If the mbd was that bad which will what it sounds like to me understand it's been really hard on the frog. Keep doing what your doing and maybe provide UVB lights for the frog that could help some too. How is the humidity level for the frog? If you raise the humidity that could help the frog to become more active and with hydration. Just give the frog time anything is possible. You can try to soak the frog in water still. Were the back legs always like that for the frog?

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