An Italian museum has defied the Vatican's request that it take down the art shown above.
Maybe my Googe-fu is weak, but I'm not sure why you can even leap to the conclusion that the frog is a Christ figure. Jesus is certainly the most commonly represented crucified figure, and the crucifixion is a central symbol — THE central symbol — of Christianity. But lots of folks got crucified. The frog could be one of the thieves. Or just an undistinguished amphibian who fell afoul of the Romans.