It certainly fits parinsignifera, but signifera can occasionally have that lyrate back pattern. Seeing as you already had the frog in your hand, the one feature that would have clinched it one way or the other is a photograph of its belly! Granular grey for parinsignifera, marbled black and white for signifera. Can you remember which it was for this beastie?
Hi wombey, the belly was definitely not marbled black and white, it actually wasn't that much different from the colouration above. Does this make sense to you?