I found this translucent little charmer at night in a shallow lily pad pond on the hotel grounds. It was sharing the pond with at least four other species of frogs and toads, and probably more.

Indonesian herp expert Frank Bambang Yuwono told me that he suspected this frog was Occidozyga sumatrana. I had originally thought that it was the extremely similar Occidozyga lima, and it might have been, but Frank knows more than I do about such things.