'Foam' in the Bible

"You say, 'He is foam on the face of the waters; their portion of the land is cursed so that no one goes to their vineyard.

“Behind him he makes a shining wake;One would think the deep to be gray-haired [with foam].

though its waters roar and foamand the mountains quake with its turmoil.Selah

As for Samaria, her king is cut off as the foam upon the water.