Foam or froth on the sea WordNet 3.0 & Open English WordNet

Sea foam, ocean foam, beach foam, or spume is a type of foam created by the agitation of seawater, particularly when it contains higher concentrations of dissolved organic matter derived from sources such as the offshore breakdown of algal blooms. Wikipedia

Foam created by the agitation of seawater Wikidata

Foam or froth of liquid, particularly that of seawater. Wiktionary

Foam of sea water. Wiktionary (translation)