Fly larva are the immature stages of flies, which are insects belonging to the order Diptera. The three crossword solutions for the term 'fly larva' are BOT (3 letters), MAGGOT (6 letters) and BOTT (4 letters). Bot and bott are both abbreviations for the word 'MAGGOT', which is the most common name for the immature stage of a fly. Maggots are typically found in decaying organic matter and are important decomposers in the environment.