The frog lures work well when fishing in lakes and ponds in areas where frogs are typically seen like near tall grass or lily pads.  It helps if you can make a splash with the frog to mimic the motion of a real frog.  A Bass may slap the frog to stun it before it bites, so don't pull it away too quickly.  Allow the fish to get a good bite and then set your hook.  You may need to be patient and give the fish some time to attack the frog.