Pond dwellers are a variety of aquatic animals that inhabit freshwater ponds. Common pond dwellers include efts (three letters), which are small salamanders, algae (four letters), which are aquatic plants, frogs (four letters), which are amphibians, newts (four letters), which are also amphibians, toads (four letters), which are also amphibians, KOI (three letters), which are ornamental fish, and Thoreau (seven letters), who was an American author and philosopher who famously lived at Walden Pond.