The Collaborative International Dictionary of English v.0.48:

Callet \Cal"let\, n. [Cf. Ir. & Gael. caile a country woman,
   strumpet.]
   A trull or prostitute; a scold or gossip. [Obs.] [Written
   also callat.]
   [1913 Webster]

The Collaborative International Dictionary of English v.0.48:

Callat \Cal"lat\, n.
   Same as Callet. [Obs.]
   [1913 Webster]

         A callat of boundless tongue.            --Shak.
   [1913 Webster]