I have a pair of zebras who I am certain are unrelated. They had a clutch of babies. 6 hatches, and now there are 6 fledglings! There are 4 who are doing beautifully and juuust about ready to be separated from the parents. I'm letting them hang out a while longer to make sure they are fully weaned, but they fly around like it's nothing now.

The other 2 though are having problems. Neither one can fly first off. I can't be sure if that's due to a wing abnormality or just that they haven't left the nest much. Both of them have deformed feet.
The first, a white poofball of a baby with just a small grey patch on top of his head, seems to have the hind toe on his left foot curled round. It sits more like thumb if you put your hand flat on the table. He can put weight on it, I've seen him perching on the bars at the bottom of the cage. However aside from that he doesn't put any weight on it. He just sort of toddles around on one leg. He tries to fly a lot, but so far has not lifted off the ground. He does preen himself though and act pretty lively. He likes to watch everyone else around him too.
The second is a grey pied, and he is the worst of the two. He doesn't try to fly really. He just wants to sit beneath whomever is near. His left foot has the toes partly fused though the leg seems fine. The right one the foot itself seems normal but the leg is twisted sideways.
They are almost fully feathered, both of them. I took out the bars on the bottom of the cage so they could walk on solid ground, and I have seed and water available to them too. I am very much hoping they will start eating on their own but so far I have seen no evidence of that. I fear the grey one may not make it given his general lack of effort, but the white one might.
Unfortunately they are all parent raised so I only saw the problem in the last couple of days. Has anyone figured out anything that I could do to maybe help give them a better chance? I've seen information on splinting legs, but in this case I am not sure that would help and I'm afraid it might even hurt. Any advice would be super helpful just now.