A freshwater polyp is a type of small aquatic organism that belongs to the phylum Cnidaria. It is typically found in freshwater habitats, such as ponds and lakes. The most common type of freshwater polyp is the HYDRA, which is a five-letter word that can be used to solve the crossword puzzle. Hydras are predatory animals that feed on small organisms, such as worms and crustaceans. They have a cylindrical body with tentacles around their mouths that they use to capture prey.