I think frogs will find your pond and stay if they like it. If they don't like your pond, even the transplanted frogs will leave.

If you have fish, be careful with tadpoles. My goldfish eat them by the hundreds.

I have never ordered from them but Willow Pond Aqua Farm has greenfrog tadpoles for $1.00 ea.
https://www.willowpondaquafarms.com/product.php?id=122

jimboace, make sure you get rid of all the bullfrogs before introducing Green Frogs (or as many as possible). The Bullfrogs will eat your Green Frogs.

Willow Pond does have green frog tadpoles, thanks.

And thanks for the advice about the bullfrogs, something I have already experienced. My last pond had leopard, green and bull frogs at first. Eventually all there was were two fat bullfrogs.

After moving from Illinois where green frogs are plentiful to Nebraska where they seem to be missing, I needed to get some. They stay in/near the water and the leopard frogs wander far away, so they don't really compete for the same food. Plus they are very tame in my experience, sometimes eating crickets right out of my hand.

I actually watched one of the big bullfrogs at my provious pond eat a sparrow that got too close!

I will be happy when my shipment of 50 tads arrive.