The term 'Former Tadpole' refers to a creature that has gone through the process of metamorphosis and has changed from a tadpole into a TOAD or FROG. The crossword solutions for this term are TOAD (4 letters) and FROG (4 letters). Both of these creatures are amphibians that start out as tadpoles, which are small, aquatic larvae with tails and gills. As they grow, they develop legs and lungs and eventually become either a TOAD or a FROG.