It’s the Ornate Burrowing Frog! 

As their name implies, these frogs spend much of their life, particularly in dry times and during the day, buried underground. They emerge to call and breed, and are known to form huge choruses with other species after heavy rains. After they breed, you'll find foamy clumps of eggs left behind.

Thanks to Dr Jodi Rowley and the Australian Museum Frog ID Project.