Why are there so few exotic Amphibians in Australian Zoos? The diversity of amphibians in Australian Zoos in general is pretty crap, most places just have Green Tree Frogs or nothing at all.
Chytrid Fungus is a major concern globally which can often restrict the movement of amphibians into other regions.
But more generally speaking, unfortunately often times Herps (Reptiles and Amphibs) are overlooked on import lists favouring the big ABC species that bring in the funding. Native amphibians are sorely underrepresented in zoological institutions as much as exotics are.