Ducks vs. Frogs

I'd like to have a pond that I can share between the ducks and the local frogs.
A friend pointed out that the ducks would probably love to eat the frogs.
Good for the ducks.
Not so good for the frogs.

Got me wondering about habitat or shelter I could provide that would give the frogs a safer place to hang out near the edge of the pond that the ducks would not be able to penetrate. Maybe just a jumble of sticks lashed together? Maybe the parts sticking up out of the water would be good perches for small birds as well.