Ouch; that sounds like a horrific feeding schedule.. once a month?! I am afraid to see what they look like.. definately, they need to get to a vet; there could be dehydration going on there that a bowl of water can't fix.. probably retained sheds as well.. this is pretty scary, and I hope it works out for you. You are a good person for wanting to help them, but hope that t is not too rocky of a road.
Heck; if they are females, and you have the cash and time to rehab them, you could feasably get them into peak health and make a good buck.. at any rate, I wish the best for you and them.