Source: Tafsir al-Ahlam al-Kabir (Ibn Sirin)
Sea foam in a dream is something useless and false speech.
Source: Ta'tir al-Anam fi Ta'bir al-Manam (Al-Nabulsi)
Foam indicates unlawful money. Whoever sees himself collecting it is collecting money unlawfully.
Source: Al-Isharat fi Ilm al-Ibarat (Ibn Shahin)
Foam is interpreted as worry. Whoever sees himself eat it will be afflicted with worry.