(1) I am not sure of the action you are describing (and no specific word springs to mind in any case). Is this done with the upper leg when the legs are crossed at the knee? Or is it just rapid shuffling of the feet, with the feet on the floor?
(2) I think what you are describing is 'drumming one's fingers'-- with the heel of the hand on the desk surface, each of the fingers is raised then tapped sharply in rapid succession?
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