I think FBTs may be on the 'smart' scale of things.
They are curious such that if one changes their environment, they check it out.
If I put a food they have not seen much, such as a worm, they'll come up to it, stare at it, dare each other to strike at it. Eventually one will. But it is tentative.
Put a cricket in the tank? They can catch them before they even hit the floor. They have been known to jump the length of the tank immediately and accurately. They love looking at the shadow of a cricket under a leaf; they will all jump to get it. The cricket either gets ate or goes flying. They are nutz for crickets. No hesitation.
Put a toadlet in the tank? The adults let them ride on their backs.
Once, I saw one that looked like it had a bloated belly. I carefully picked him up. He deflated...just trying to float...no problem.
But then something remarkable happened. As I had this frog upside down, he struggled a bit as one would expect...then he went limp. It was not an unken reflex. Froggy just relaxed and let all four legs droop down. I'm holding the frog upside down, mind you, and it relaxes completely. I was a little worried until I put him back into the tank, where he woke up and hopped away.
I know you are not supposed to touch them, and at first, I had a bad skin reaction whenever I as much as touched the water. But i've gotten used to it and can apparently handle one without any reaction now. little upside down relaxed frog in my hand was just a pool of jello. as if it had no bones at all.