NCAA: passing is throwing the ball, otherwise it would be fumbling. So, if you want to get technical, dropping is fumbling, using force (ie. throwing) is passing. It looks like the kid uses force in this case to throw the ball into the ground, so you could call it a pass.
Then again, this is very close and you probably should go with the when-in-doubts and rule it a backward pass anyway.
In general, I think these kinds of actions should be ruled fumbles instead of passes - there is no intent to pass the ball to a team mate.