Lewis & Short

frĭtinnĭo, īre, v. n., to twitter or chirp as a small bird.

  1. I. Lit.: et pullos peperit fritinnientes, Varr. ap. Non. 7, 15; of the cicada: et cuculi cuculant et rauca cicada fritinnit, Auct. Carm. Phil. 35.
  2. II. Transf., of the noise made by young children: sic dulci Marcus qui nunc sermone fritinnit, Poët. ap. Anthol. Lat. I. p. 603 ed. Burm.