I love the green tree frogs. I lived at Kenilworth in the Sunshine Coast Hinterland for a year and whenever it rained there would be dozens of them around the house. We didn't have any screens in the house and one night this huge one jumped through the window and landed on my pillow. Scared the begebbers out of me and he wasn't too happy when I was trying to make him go back outside.
I would have to say infrafrenata. However, my favourite frog....hmm...possibly Neobatrachus pictus, they have such cute lil babies and such interesting ecology.