Wow, I'm surprised at all of the MH fast action selections for lighter top water lures, but if thats what works for you where you fish, then keep on keepin' on.
For Me:
For light top waters (poppers, tiny torpedos, etc) I prefer a medium rod with a very parabolic bend, much like a cranking rod. The soft bend helps keeps the smaller trebles planted when the fish decides to dance, which they almost always do when topwater fishing. Also, because the lures are so light, the parabolic bend doesnt affect the action of the lures, they still pop hard, walk, and jump nicely, and the lighter action and slower tip speed allows for more accurate casting.
For top water frogs and other lures that have larger diameter hooks and a bit more mass, I prefer a medium-heavy/moderate to a medium-heavy/fast rod. I generally prefer a slower rod to a fast rod because I feel as though I can feel things a lot better, and I don't really have heavy slop where Im fishing.
As a side note:
If you have a friend with multiple style/speeds/actions of rods, ask him if you can borrow a few rods and go try them out at your local waters. You would really be surprised how much your opinion of what you need varies from what a lot of internet opinions would lead you to believe(mine included).
Basically, there are typical/generic answers to all of the "which rod is best for this application" type questions, but more so than not, your water type and the structure within it will more accurately define the type of rod you will need, more so than even lure selection in some instances.