Field Goal question
 

NFHS K attempting a long field goal. R puts a player in the end zone near the goal post.
The kick is gonna be close and as the ball comes down the R player jumps up and (a) swats it away, where it falls to the ground in the endzone or (b) deflects it over the crossbar.

What is the call?

I know you asked NFHS....here's an answer for the NFL:

A.) Unsportsmanlike conduct for goaltending. Team A can either take the awarded 3 points and kick off from A35 or enforce the 15 yard penalty from the previous spot and an automatic first down. B.) No penalty as the deflection didn't cause the field goal to be missed.

NFL Case Book

A.R. 12.108 GOAL TENDING
Fourth-and-10 on B30. On an attempted field goal by A2 from the B37, B3 stands under the goal post and jumps above the crossbar and deflects (or catches) the kick so that it does not cross the crossbar, for what would have been, a successful field goal.
Ruling: Option for Team A: Three points awarded to Team A and Kickoff A35; or first-and-10 on B15.
Palpably unfair act. (12-3-1-s)
NOTE: If the field goal had been successful despite B3’s action, there would be no foul.

NFHS Case Book 6.3.1 SITUATION B: During a field-goal attempt, R1, who is in the end zone, leaps up and blocks the ball away from the crossbar. RULING: Touchback. The touching by R1 in the end zone causes the ball to become dead, unless the ball caroms through the goal, thus scoring a field goal. This is not illegal batting, as the touching caused the kick to fail. (4-2-2d(2); 6-3-1b)