Prattle, n.
Trifling or childish tattle; empty talk; loquacity on trivial subjects; prate; babble. Mere prattle, without practice. Shak.
2 other Webster entries under this spelling
Prattle, v. i. [imp. & p. p. Prattled; p. pr. & vb. n. Prattling.]
To talk much and idly; to prate; hence, to talk lightly and artlessly, like a child; to utter child's talk.
Prattle, v. t.
To utter as prattle; to babble; as, to prattle treason. Addison.
Shades of meaning
Fernald has no entry of its own for prattle; he lists it under babble.
He lists it without comment; the entries above explain its neighbors.