I spotted this iPhone game last week and start playing it... and I hooked to it already... such a simple but cool and fun game. Discover, collect, trade, and breed over unique frogs. Place your collection in habitats, each habitat can have 8 frogs, and place it in the pond to feed, grow, and breed... and there are limitless supply of dragonfly for your frogs to eat by just jumps over it :) and yes, some rewards (frogs, background, coins, or scenery) as well if you are lucky.
Not sure how many levels does this game have, but I am already @ level 6 after playing it for less than a week.
You can connect with your friends with Plus+ and trade frogs and habitat items with them. You can also view your friends' habitats and frogs.
Here are some screen capture of my latest Pocket Frogs status:
See more screen captures from my Pocket Frogs album
here.