Pond organisms are living things that inhabit ponds and other bodies of water. The two crossword solutions for the term 'pond organism' are ALGA (4 letters) and Greenalga (9 letters). ALGA is a type of aquatic plant that is usually found in freshwater environments, while Greenalga is a type of ALGA that is green in color due to the presence of chlorophyll. Both of these organisms are important components of pond ecosystems, providing food and oxygen for other organisms.