The Collaborative International Dictionary of English v.0.48:

Spawl \Spawl\, v. i. & t. [imp. & p. p. Spawled; p. pr. & vb.
   n. Spawling.] [Cf. AS. sp[=a]tlian.]
   To scatter spittle from the mouth; to spit, as saliva.
   [1913 Webster]

         Why must he sputter, spawl, and slaver it
         In vain, against the people's favorite.  --Swift.
   [1913 Webster]