Yeah that’s quite a severe infestation. Honestly there’s not too many regulars on this forum anymore, I would try a different forum or a facebook group for those knowledge enough to give a specific ID. Regardless, in the absence of a vet the only viable option is going to be to treat the frog yourself. I’m not really knowledgable in the antibiotics department but maybe if you can consult with a vet over the phone or something? Hope your little guy pulls through!