Limnodynastes peronii Striped Marsh Frog
Some other names for this species:
Brown-striped Frog, Brown Frog
on grounds of Mt. Glorious Getaway Cottages, Queensland, AustraliaFebruary 17, 2003
Striped Marsh Frog (Limnodynastes peronii)
These frogs are commonly heard all up and down the east coast of Australia, but they are maddeningly hard to see. They make a soft "toc" sound, repeated every few seconds, that echoes and bounces such that its origin is extremely difficult to pinpoint. I spent at least ten minutes within three feet of this frog before I finally saw it.

Here is a complete list of the reptiles and frogs I saw on this trip to Australia.

Illawara Escarpment Conservation Reserve, New South Wales, AustraliaOctober 3, 2015
Striped Marsh Frog (Limnodynastes peronii)
This cheerfully fat frog was lurking beneath an old board that also covered a couple of skinks. The skinks dispersed quickly when the board was gently lifted, but the frog just sat there in its fat froggy way.
Printed references: