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Pelophylax esculentus
It's about 1.5 - 2 centimeters long and I found it in Kopački rit.
Kopački rit, Croatia
This may also be a pool frog (Pelophylax lessonae), one of the parental frogs of Pelophylax esculentus which is a hybrid. The distribution is similar to that of the Edible frog and and both species show a similar range of colourings. Lessonae has a larger metatarsal tubercle but these are not visible on the picture.