I find a couple of frogs. It was cca. 4inches long and 2inches wide. Photo was taken in Prague, Czech republic, middle Europe.. Same zoomed.
Yes, this is almost certainly Bufo bufo. It has the stocky figure and the warty skin, ruling out the true frogs. It lacks the stripes of B. calamita or Pelobatus fuscus. It is brown without the green colors of Alytes obstetricans. A red yellow or red belly is not visible at the photos, but I assume you would have noticed it if it was present (ruling out Bombina sp.). See here for some pictures of European toads (not complete and in Dutch, but pictures and latin names are clear.
Finally: a city like Prague lacks specific habitats of the more rare species. Common toad is the most likely to be found there.