How To Sign a Frog

I was just IMing someone about Industrial Design, and “big ponder” Frog Design came up. He told me his wife, who knows American Sign Language, had just made the sign for frog; he passed it along when I expressed interest. The page shows a bunch of static images, and I thought the sign was spelled out…I had imagined it being like an intricate hand shadow so I was initially disappointed. But then I tried the instructions and realized that the sign moved like a frog…awesome!