If I stock it with turtles and frogs though, will they stay if the pond suits their needs?
And how long do you think it would take for larger animals to discover the pond and stick around? I would do as much as possible to attract other animals, for example bird feeders, snake hibernacula, compost piles, and planting lots of beneficial native plants. I wouldn't dig a big hole, fill it with water, and plunk a turtle in it.
I'm wondering specifically what to stock with though, as far as turtles, frogs and larger fish. I would get more than enough minnows, crayfish, shrimp, etc to start a food chain, but I'm iffy about some animals. Would a few catfish or eels scare off any smaller animals, or deplete the populations of food? They don't seem to get particularly massive around here, the biggest ours have grown on exhibit are about a foot for the cats and 18 inches for the eel. I know we have them in our pond, but I have no idea how many. As for turtles, I would try for around the same amount our pond has. From what I can count, there are 3 snappers, about 10 red-ears, and around 7 painteds. Other than that, there are unknown numbers of stinkpots and muds, and the occasional spotted. Again, I'll have to see what I can get from one of our 'pond raids'.
Hidden Pond nature center is in Springfield, Virginia. A little far from New Hampshire! But if you ever pass through, feel free to pop in sometime, maybe during my shift!
And I have no idea who Frank Lloyd Wight is... sorry.