the.com/prattler

means A person who chatters on and on about trivial things, often without saying much of substance.

from From 'prattle,' which popped up in the 1500s as a frequentative form of 'prate' — that is, 'prate' plus a suffix implying repeated, small-scale action, the same pattern you see in 'babble' or 'wobble.' 'Prate' itself is probably related to Low German and Dutch words for chattering or gossiping, likely echoic in origin — meaning it may have been coined to imitate the very sound of idle talk. So a prattler is, by the word's own built-in logic, someone doing a little version of empty talk, over and over.