Thank you Esshup:
Would the frogs go out where it is deep, or stay close to the shore where it is sandy? They also like to hang out where I have some flat flagstone propped up over a tube. I really like them. I had the metal bottom of an outdoor cat cage at the water's edge last year before I could shore everything up. They were under there and when they croaked it was very magnified, like you would expect to see a huge frog. It was funny.