What is the verb or expression for describing some kids in this situation?
1.) My parents were always yelling at my little brothers, "Hey kids! Stop that roughhousing!" Other colorful words usually accompanied these demands, but I'm saving those for another OP.
roughhouse verb: gerund or present participle: roughhousing: act in a boisterous, violent manner. "in front of the stage hundreds of teens and young adults roughhouse, flinging themselves into each other"
PS - In more or less the same vein there is, "grab-assing"; i.e., The boss was furious because his employees were always grab-assing instead of working.
2.) The crowd of people in the second picture are "jostling" for with each other to get into a better position to receive whatever those goodies are that are being handed-out to the crowd.
jostle verb: gerund or present participle: jostling: to push, elbow, or bump against (someone) roughly, typically in a crowd. "passengers arriving and departing, jostling one another"; "jostled by the crowd"
synonyms: bump into/against, knock into/against, bang into, collide with, plow into, jolt;
• struggle, vie, jockey, scramble, crowd one another. "media empires jostle to catch the eye of Asian readers and viewers"
• struggle or compete forcefully for. "a jumble of images jostled for attention"
Scrambling
Struggle or compete with others for something in an eager or uncontrolled and undignified way.
Perform (an action) or achieve (a result) hurriedly, clumsily, or with difficulty.
Horseplaying
Rough or rowdy play that can often result in unintentional physical harm.