I am not so familiar with frogs around Sydney but i am fairly good at queensland frogs. I am not so sure that it is Litoria peronii, it certainly could be but they don't seem to have any spots on their back or yellow on the upper legs and arms. Having said that frogs can vary a lot in appearance therefore calls can be a more conclusive way of identifying them. Go to the Frogs of Australia website and listen to the calls for Litoria peroni, if they match then it definitely is that, if not try Litoria littlejohni as they have a very cricket like call. It is also possible your seeing one type of frog and hearing another type of frog. Anyway if you want to listen to the frog calls in your area here is a list of sydney frogs and most have a recording of the frog call http://frogs.org.au/frogs/ofNSW/Sydney
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