froth

a mass of small bubbles formed in or on a liquid; "the beer had a thick head of foam"

become bubbly or frothy or foaming; "The boiling soup was frothing"; "The river was foaming"; "Sparkling water"

make froth or foam and become bubbly; "The river foamed"

exude or expel foam; "the angry man was frothing at the mouth"