Litoria staccato (Chattering Rock Frog). I originally thought this cutie was a L coplandi, but after reading the notes on L staccato, the call description matches exactly. It was confusing to find, with the high pitched notes, pause then contrasting soft call made me think I was looking for two separate frogs, specially when they did it in chorus. However I could only ever find the one frog!
Found at Surveyors Pool - shallow water with small pools flowing over a reedy rocky platform, Mitchell Plateau, WA