Use a frog lure near the grassline. Something that moves/splashes on the surface a lot. In an area that you know they are living/breeding, they will bite it, and probably within 10 casts. They put up a heck of a fight! When you get one on deck/dock/shore be sure to have leather gloves on. They bite, even when hooked. I wear combat boots, step on them, then chop their heads off.