Here's a list of native reptiles/amphibians in Australian zoos. I'm only gonna list a species once even if they're at multiple zoos. The first post under this one is zoos I've been to and I'll continue it onto another post which is zoos I haven't visited.
Perhaps narrowing the scope to species with less than 20 individuals represented or those considered threatened in some capacity maybe a way to narrow the scope just to avoid every zoo having an Eastern Blue Tongue, a Shingleback and a Children's Python while not every collection has Oenpelli Pythons, Great Desert Skinks or Crucifix Frogs.