One day does not define a spot.
Tina and I have a favorite spot that we KNOW contains fish and we have fished it a number of times that we have caught zippo, zilch, nada, nothin, skunked.
We know that the pond holds fish because we have also caught dinks, bream so big they look deformed, crappie that spin the kayaks, and monster BASS that make world class fisherman stop and go, "Holy Crap!" (Tina caught five citations from that pond last year alone.) But, we still go back time and again and get skunked.
In your case, it may have been an off day, or the right day and the wrong time of day. If it looks fishy, work it. The frog advice is good, but you need to work the frogs.
You can buzz the frog across the pond in the center
Buzz it out from the edge of the grass
Toss it on the bank and tweek it into the water and then slowly swim it..
You get the drift...
If that doesn't work, try the worms, or swimbaits rigged weedless.
A good friend of mine has a six year old son and when they stepped out of a kayak one afternoon near us as we pulled our kayaks from the water for the day, we asked him if he caught anything.
He grinned, his face lighting up the parking lot. "NOPE" he said, "But I had a great time with my dad. It was a great day in the kayak, and we spent the whole day together. Besides, they don't call it catchin, they call it fishing."
Out of the mouths of babes...