Screaming kids engulfed with the rage of feral youth! Angry monkeys have the same expression. Obviously the photographer told them all to yell, and HOLD IT. The kid in red is going as best as he can to pretend; the kid in blue is showing the personality that would later come handy in his job as a longshoreman’s union strike enforcer; green kid is impressed by Alpha Boy, and brown kid was thinking “I hope my face doesn’t stay this way.”
I’m not a fan of plaid, but those plaid cuffs are an interesting look - odd how it’s never come back. Ever.