Also discovered was a small boulder-dwelling frog, the Blotched Boulder-frog, which during the dry season lives deep in the labyrinth of the boulder-field where conditions are cool and moist, allowing female frogs to lay their eggs in wet cracks in the rocks.
In the absence of water, the tadpole develops within the egg and a fully formed frog hatches out.
Once the summer wet season begins the frogs emerge on the surface of the rocks to feed and breed in the rain.
Tim Laman, a National Geographic photographer and Harvard University researcher who joined Hoskin on the expedition, said he was stunned to know such undiscovered places remained.
"What's really exciting about this expedition is that in a place like Australia, which people think is fairly well explored, there are still places like Cape Melville where there are all these species to discover," he said.
"There's still a big world out there to explore."
According to National Geographic, the team plans to return to Cape Melville within months to search for more new species, including snails, spiders, and perhaps even small mammals.
"All the animals from Cape Melville are incredible just for their ability to persist for millions of years in the same area and not go extinct. It's just mind-blowing," Hoskin said.