I have no idea of what this is but it looks like a Sundowner that escaped from Chernobyl. Mutated!
Same frog but I just found him and got some more photos, you can see the red on its leg.
I think this is some type of red frog. It is roughly 30 mm. It has a bright vivid red stripe on the two back legs on the inner side of the leg, it only extends to the knee joint of the leg.