froth

...(E)=bubbles on liquid,=frotha(ON)=afreothan(OE/verb)=f(r)/potl/t/th=potli(N)= pond/puddle/punt/ both/broth/brother, i.e., the brother of Lady Liquid=Bubbles, c.f., pottle(E)=bottom(E)/dregs of a briar pipe.