>But not sure if he acted before (in tv)

He had.

> Do you have other samples or favorites?

I would say 99% of child actors are terrible, but sometimes we are graced by a child who can act - Tatum O’Neil’s performance in Paper moon comes to mind.

It is considerably harder to think through this for adult actors, who are either grown up child actors (like Bale) or who made it big after a slate of small appearances (like many of the answers in this thread).