No he would not be correct in giving a T.
10-4
ART. 1
The head coach is responsible for his/her own conduct and behavior, as well as substitutes, disqualified team members and all other bench personnel. Bench personnel, including the head coach, shall not:
i. Grasping either basket except to prevent injury; dunking or stuffing, or attempting to dunk or stuff a dead ball.
The boys dunking do not fall fall under any of those categories.
As to your second question...I would answer if called in that situation.