‘Kero’ is an electronic talking puppet, the brain child of engineer Saitama Prefecture. As his very name says Kero is the puppet frog who can talk and sing and obviously croak. To be a little more precise, the Keromin frog can produce as many as 12 various sounds including a croak, human voice, pipe organs and even violins. Once you put your hand inside him like any other ordinary puppet and open his mouth he starts singing. That’s incredible, quite an exciting jolt for the kids for sure!