Has Manny's head increased in size???

Putting on weight, growing his hair and beard have all conspired to make his head appear larger. Look at pictures of yourself or people you know compared to their teenage selves and all of their heads will look larger.

 

Its called water retention man... he's got a moon face now

 

I've actually misquoted your post instead of garfios' immediately after yours.
So no, I'm not replying to the increase in the head size but rather on the notion that Pac's head is bigger than usual. (His is actually still relatively smaller. Met him once in a local mall)

 

it's full of confidence