Hi Cindy. Their exact name is Alaska Piks, if that helps. I've tried them out, but I found that you need to have a respectable fingernail just to hold them on securely, since the way you hit the strings with them tends to push them off. And the lack of respectable fingernails is the reason I wanted fingerpicks in the first place. It's a neat concept, though, and if you have better nails than me it might work for you.
El Greko, the Alaskas are actually a different idea from standard fingerpicks: the picking surface is on the nail side of your finger, not the fleshy side. You could almost think of them as detachable falsies.