Others may be using this tactic, but I'll give the credit to my brother Carson for perfecting it. When he suggested it for the first time I was fairly skeptical, but after trying it several times the last couple years I'm convinced it works. His lure of choice is a Zara Spook and he forward trolls the boat slightly faster than idle speed. He lets out 60-80 feet of line and twitches his wrist and lightly pops the rod tip causing the lure to bob back and forth to achieve an exaggerated "Walk the Dog" lure motion. I quickly found the two things you can do wrong is to leave too much slack in line and not pop the lure in a consistent pattern. That will result in plenty of missed strikes.
We've caught many fish topwater trolling over the last couple years similar to the one Carson is holding above. I've even been surprised to catch a couple walleye when trolling over shallower areas. Our best outing yielded over two dozen fish in less than an hour trolling over the top of submerged weeds on Red Lake. I plan to try other types of topwater lures next season. Give topwater trolling a try this season and see what you think!