Frog/frɑːɡ/ Definition 1 of 5Pro Tip 1/3Amphibian Feature Frogs are amphibians, meaning they can live both in water and on land during their life cycle. Look at the frog leap from the pond to the shore! Pro Tip 2/3Sound Association 'Frog' is often used to describe the croaking sound they make, especially at night. The night was filled with the sound of frogs. Pro Tip 3/3Cultural Symbol In different cultures, frogs may symbolize luck, purity, or rebirth. She wore a frog pendant for good luck.