leader of a cheering group; head cheerleader
Refers to the person who leads a cheering squad, often in school sports or events. Can be used for both formal cheerleading teams and informal cheering groups.
As the head cheerleader, he energized the team.
The cheerleading leader's call united the audience.
Compound of 応援 (cheering, support) + 団 (group) + 長 (leader). The term is straightforward and modern.