When I was a kid, many moons ago, yes. But this recent thread
https://boards.straightdope.com/t/without-saying-your-age-whats-something-from-your-childhood-that-a-younger-person-wouldnt-understand/
says today it is no longer the case. Library catalogues are mentioned at least four times, and I did not post it myself.
BTW: The question was a little longer than what you replied to, but never mind.
And no, I know no dumb kids. I know nobody younger than 40. Really.