This might sound wierd but I saw my first leopard frog tonight in my other pond.  Leopard frogs are super common in Minnesota, but down here in Costa Rica I've never seen one.  I also live in a very dry part.  For the last two years of owning a pond I've just had huge toads.  I guess Kevin Costner and my Biologist father had it right when they said "build it and they will come."