associating people with food doesn't really qualify as intelligence in my opinion. Since I have worked extensively with trout and other salmonids both in the wild and in hatchery settings, I think my experience is relevant here. The "shy" fish are actually using their habitat to more full advantage, not fighting the current to find food, but instead letting the current bring food to them."shyness" in this case is efficiency, and is a much more desirable trait, because the animal remains relatively inconspicuous, and exerts far less energy to obtain food. The "bold" fish are exerting far more energ in their search for food, and are also making themselves more vulnerable to predation. "Boldness" then in this case, is counterproductive, "less intelligent" if you will. hatchery rased fish for the most part never learn how to use their fluid environment to full advantage, and so have a much lower success rate once in the wild. Also, since they have "learned" to associate shadows on the water with food, and are ony looking UP for food, they are much more easily preyed upon.
This is CONDITIONING, not intelligence.
Frogs definitely get conditioned to associate people with food, Ill vouch for that, but I wouldnt call it intelligence