foam, froth -- (a mass of small bubbles formed in or on a liquid; "the beer had a thick head of foam")
Overview of verb froth
The verb froth has 3 senses
foam, froth, fizz, effervesce, sparkle, form bubbles -- (become bubbly or frothy or foaming; "The boiling soup was frothing"; "The river was foaming"; "Sparkling water")
froth, spume, suds -- (make froth or foam and become bubbly; "The river foamed")
froth -- (exude or expel foam; "the angry man was frothing at the mouth")