The problem is the frogs are NOT in the wild. They have YOU to care for them. Sure, in the wild, they would possibly die from being ill, but yours aren't in the wild and have the advantage over wild frogs in that they have you that can help them recover.
I'm not sure how fecal exams are stressful on the frog or bad for them. There is a lot less stress involved with handling them than there is opening their tank, taking a piece of dung and shipping it off to a vet.
Another point, these things you mentioned, vet visits, meds, ect, are also not natural to an animal like a dog or a cat either, but I'm sure you would have no issue taking them? Yes, mammals and amphibians are totally different, but in this instance, not really. You made a decision to care for an animal, then why wouldn't you want to give it the best care possible?
Education is the most powerful weapon we can use to change the world ~ Nelson Mandela





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