Prattle
Part of speech: verb
Definition: to talk incessantly and in a childish manner; to babble.
Part of speech: noun
Definition: Silly, childish, talk; babble.
Clack
Part of speech: verb
Definition: to make such a soundto chatter
Part of speech: noun
Definition: an abrupt, sharp sound, especially one made by two hard objects colliding repetitively; a clatter; in sound, midway between a click and a clunkchatter