Hi Alejandra:
Sorry to hear about your frogs
Mar-oxy is an antifungal. When frogs bloat, it is usually caused by a bacterial infection, so you need to use Maracyn II or Maracyn Plus along with a salt bath. Unfortunately, I don't know the dosage requirements for African dwarf frogs. Try cutting the regular dose by one half. The salt bath will relieve the bloating. Use about 1/4 teaspoon of sea salt per quart of water (don't use iodized table salt). The baths should last about 30 minutes a day until the bloating eases. Good luck and hope all goes well.