Force feeding stressed out frogs due to a possible chemical burn can make things worse, by the handling of damaged skin . Think they really need a vet visit now; any local herp veterinarians available?

Until you do so; only thing can think of, is to make an unflavored Pedialyte or similar baby electrolyte solution (10% Pedialyte and 90% dechlorinated tap water) and using a dropper; apply to their body (clear of mouth & nostrils) at least twice a day. Good luck !