Though I doubt you’ll ever see a frog doing this in nature, here we have a frog standing up on his hind legs. I guess we could classify this as a anthropomorphic frog image.
Whatever you decide to call him, I think he’s quite a dapper fellow.
The Peacock and the Wishing Fairy was released in 1921; it contained numerous illustrations by Dugald Stewart Walker (1883-1937).
This image is copyright free and in the public domain anywhere that extends copyrights 70 years after death or at least 120 years after publication when the original illustrator is unknown.