The bad news is that the frog was sealed inside the cornerstone of the Tregoweth Brown Building, to remain preserved in a state of suspended animation until that edifice is demolished in the far-flung future year of 2056 AD. So we shall be deprived of his antics for another half-century, alas.
The good news is that, by the time he is finally unearthed, technology will have advanced to the point that disintegrator rays will be commonplace tools of urban demolition experts. So there’ll still be fun things to play with while we’re all waiting for the frog to return.