Dendropsophus leucophyllatus.
This was only the second time that I have seen this frog and I must have visited Paignton more than 30 times since it went on show: I only saw it for the first time when @MagpieGoose pointed it out to me. I have learned to check the leaves in its vivarium very carefully but it was still a surprise to get a relatively clear view and a chance to grab a photo.
