No, the back ones just don't move at all and kind of flop about if he is moved.
He's made some improvement though and one of the legs now goes to a normal frog position but he still doesn't use it. He just ate a cricket that I coated with the multivitamin powder I use on my other pacman. The next cricket he gets will have calcium.

Edit: if the leg that pulled up to his body is touched he does react.