This is all good advice. Yeah, the two times during daylight you can reasonable expect a topwater bite are morning and evening. I'm no expert, but I do fish topwaters a lot. Of course, there are times that will make a liar out of me.
I find the best places to get bites on frogs are shallower, smaller bodies of water and places with a lot of cover. Some have said they get bites in open water on them and I'm sure they do, but I don't. I get bites in ponds with dark water, lilies and flooded timber where the water is probably no more than 8 ft deep except at the dam. If I come to a place with a lot of large lilies, I'm sure to put a frog on.
When I get a bite, I don't yank. I reel down to it quickly, feel the fish and set it HARD. They will usually hol it a couple seconds and I don't take that long. I have a rod specifically for frogs in junk. I use 50# braid on it. Sometimes the fish don't bite the bait but rather slap at it. If you can see it, it wasn't a bite. Let it rest a few seconds and resume the retrieve slowly.
If you get a bite that misses, you can toss a Senko type bait over and often catch that fish. I guess the fish thinks it stunned its prey. I almost always have a Trick Worm tied on in shallower ponds.
I see others have mentioned bending out the hooks, which I do before I even tie frogs on. Also, hold the frog nose down so the skirts hang to each side and trim those skirts about even with the frog eyes. Some trim them even more. I usually trim to the eyes and stop there. This makes a smaller target for the fish to bite.