I know that site ... its great ... I have also a Field Guide to Frogs of Australia by Martyn Robinson from the Australian Museum.
and yes ... Ive heard the little frog (pictured) calling ... but never any replies. (He is very small ...not much bigger than 50c coin). Hes been around ... on and off ... for about 3 years now.
I also have Striped Marsh Frogs (Limnodynastes peroni) ... They are more permanent residents in my pond and are breeding like crazy... they are very common in our area...and sound (annoyingly) like a dripping tap.
We have the endangered Green & Gold Bell Frog (Litoria aurea) here in the Illawarra but I have NEVER seen one. I have heard they like the storm water pipes around Port Kembla ... and there is a colony at the Sulphuric Acid Plant out there at Bluescope Steel .... a very strange habitat choice.
Im told they like to sunbake on Lomandra longifolia during the day .... and that their call sounds a bit like a lawn-mower....?
Also relatively common is the Bleeting Tree Frog (Litoria dentata) ... but you only hear them when it rains. They sound like bleeting lambs.

I sometimes hear them in my area but none have adopted my yard .... yet.
Frogs are soooo cool

....thats a great job there with the breeding.