Aún no tenemos significados para "froth lips".
1From frothing lips he hurled blasphemies and insults at his tormentor.
2I could see the white gleaming teeth, the frothing lips, the eyes glaring in madness or terror.
3And the thing jumped at them and gnashed its teeth and then spat upon them from frothing lips.
4Then a look of madness crossed his face and he sprang up, with frothing lips, and struck at me.