Trying to remove frogs and turtles from a pond is like trying to remove ants from your lawn. You will need to destroy the ecosystem to manage it, and they will keep coming back anyways. A portion of the frogs you see today wont be there tomorrow as they will be off hunting or moved to another nearby water hole. They constantly are on the move at night.

Your daughter is going to need to learn to live with them if she wants to swim. Sign her up for a local nature class or something to get her hands on and more people to show her there is nothing to be afraid of.

Snakes on the other hand... we are currently hosting as very large 4.5ft northern water snake. Probably a mama. I am the only one who will go in the water right now, as that thing swam along side me out to the float dock the other day. They are admittedly creepy. I near shat myself.