I think it is important that people realise the sheer volume and diversity that we vet students are bombarded with and expected to assimilate-and then remember for the rest of our working lives! In Britain (i can say nothing of veterinarians educated in the states-however several British universities have Veterinary faculties which meet standards required for AVMA acredditation) students are taught anatomy, physiology, medicine and surgery primarily of common pets and animals of economic importance first, as these make up the greatest percentage of cases one will see. This covers any species in itself! Unfortunately, as the "interest" in herps is not as great as these other species-and amphibia in particular are not commonly stumbled upon in general practice-so the percentage of the course that covers these animals is small. However, veterinary students are expected to be capable of continual self directed learning-as fully qualified vets we will have to keep ourselves up to date with latest research, treatments and preventions. Many underlying principles of veterinary medicine carry through different species, and so your vet should at least be able to give you some advice whilst he/she reads up on the animal/condition and/or consults a specialist.
I have come across a similar problem with vets and poultry-i breed game fowl for exhibition and few vets know what to do with hens taken out of the commercial flock setting. More often than not, the bulk of knowledge regarding the species will be in the hands of the owner/breeder, but the bulk of knowledge regarding disease, injury and other clinical conditions lies with the veterinarian. It is therefore vital for the welfare of the animals involved that owners and vets develop a relationship which is respectful of both parties superior knowledge in differing areas.