Can you take them to a vet?
On the face, I see some black "dots" as well, is that dirt or sticktight fleas?
They may have something like Wet Fowl Pox, but it could also be Canker or another illness or disease. I'm not exactly sure if Pox or Canker cause leg/foot lesions.
It's hard to tell you how to treat since it could be a few different things and each thing requires a different type of treatment.
Clean and sanitize their water. You can apply some iodine to the scabs on the beak, this may help dry it up, for they eye use some Vetericyn Eye Gel or Terramycin Eye ointment. Don't pick off scabs, but check those dots to see if it is dirt or fleas.
If it is fleas, pick those off with some tweezers and apply a small amount of vaseline with a q-tip to "smother" any remaining. If it does turn out to be fleas, give them a dusting with poultry dust around the vent and under the wings, because they may have some lice/mites as well.
For the legs, soak them in a warm bath of epsom salts and apply a small amount of triple antibiotic ointment to the legs.
Make sure they are drinking plenty of water.
