Yes thats common. They 'learn' to associate the bowl with tasty food. Its called a pavlovian response. Many kinds of animals ,even snakes can exhibit this kind of behaviour, which makes sense in terms of survival, AKA recognise and remember
the behaviours of both prey and predator for example.
Not sure id nessesarily equate this with intelligence as such. Define intelligence.
I tend to stop short at the border of appreciating an animals 'learning' and anthropomorphising them.
That said, until we smart monkeys can personally experience the conciousness of another species, we cant know for sure exactly how like us (mentally) they may be.
I think its enough to respect life and appreciate it, wherever and whatever it is, not only if it can kill you.
Enjoy your chameleon