There certainly where some large amphibians in the early Permian. Such as this Eryops. Obviously not this one, it is a drawing. Well, a digital representation of a drawing. The drawing itself is actually based on a photo. Of course when I say photo, I mean a file on the internet that when interpreted a certain way becomes an image, which corresponds to the photo.
Still it is based on a photo of a skeleton. Well, a fossil. Fossils are not bone after all, it is the result of a mineralisation process that replaces biological material with rock. Actually, once you think about it, it isn’t really a drawing of a Eryops at all. Sorry about that. You may as well go.