The term 'Playground Problem' refers to the issues that can arise when children are unsupervised in a playground. The two crossword solutions for this term are 'BRAT' and 'BULLY'. A BRAT is a child who behaves badly, often by being rude or disobedient. A BULLY is someone who uses their strength or power to intimidate or harm others. Both of these behaviors can lead to serious issues in a playground setting if left unchecked.