“Does my child need therapy for anger?”

There are multiple reasons for anger, a prominent reason is the consumption of foods that cause inflammation and anxiety. To see if this is a contributory factor no consumption of dairy, sugar (ice cream or cheese or pizza), or grains for 2 weeks. The anger could be simply managed with proper dietary guidance.

See this link...
https://www.yalemedicine.org/conditions/anger-issues-in-children-and-teens#:~:text=Cognitive%20behavioral%20therapy%20(CBT)%20is,anger%20triggers%20and%20preventive%20strategies.