Emily I see bigger problem that poop is runny then these "grains".
sorry guys couldn't find anything that I can post legally.

the point is anything that frogs or reptiles (viruses, fungus, bacteria, parasites or protozoa) might have is not contagious to human. The only exception is Salmonella, it is transmitted through turtles/tortoises, however in theory reptiles might have it too and pass to human. Common sense is needed when handling reptiles, wash your hands, do not eat their poop, things like that and you'll be fine