They’re a secondary sexual characteristic, so it seems like something that would get attention.
I know this “seems” correct, but I’m curious if there’s actually a strong correlation between prominent adam’s apples and deep voices? In my experience, it’s not particularly strong. Plenty of guys with big adam’s apples don’t have deep voices and plenty of deep voiced men don’t have prominent adam’s apples.
It looks correct: https://en.wikipedia.org/wiki/Adam's_apple