Some kids are noisy when they consentrate. I'd start looking around for quiet fidget objects and look at this as a great opportunity to teach metacognition. As school progresses being noisy is more and more frowned upon.
Chewing gum, worry beads, squeezie apple, destroying pens, chewing on pencils, seated pushups are all reasonable fidgit activities - part of each person's job is to find ways that they can be comfortable without bother the people next to them. These may not sound appealing, but they sure beat some more destructive fidgit habits I can think of.
Best Wishes,
Grinity
