http://www.ribbitking.com/
It's slated for release in June, at least that's what the website says. It's a featured demo on the newest PS2 kiosk demo disc. I got the chance to try it the other day, and I found to be rather fun. It's kinda like the game you see at amusement parks where they put a rubber frog on a fulcrum and you hit the device to launch the frog onto a lilly pad/flower, but you usually end up hitting him into the surrounding water.
The PS2 version might be an easier find, since it could be like Magic Pengel--quirky Japanese fun that gets recognized by a major publication, but I'm 95% certain the Cube one will be tough to come by.
Just a friendly heads-up. And check the game out if you get the chance.