The frog

[davidjackson]

I looked it up in the facsimile and attach two photos.
It's a bit vague, but that's how it is in real life I'm afraid.
If you look at the image, it has a long section of body tapering into a tail which is painted in a strong green; and a head which is not painted.
I suspect it is a tadpole halfway through metamorphosis, with tiny legs.
The bigger picture is a photo of the image under a magnifying glass, the cropped image a direct photo.