Tonsils don’t “move” exactly, not by themselves anyway, when you swallow, or breath they move with your entire throat.
Tonsils don’t “grab” things either, they filter. They’re essential a filter for all the bacteria and other bad stuff you breath in through your nose and mouth, or swallow. Tonsils have gaps and folds to make it more efficient to catch/filter things.
When a lot of things have been caught, it starts to get inflamed, or swell. When too much stuff has been caught (or filtered) it might lump together into a tonsil stone.
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