What best describes a tetard?

A tetard, more commonly known as a tadpole, is the larval stage of amphibians, particularly frogs and toads. They are aquatic and typically have a streamlined body, a long tail, and gills for breathing underwater. As they mature, tetards undergo metamorphosis, developing legs and lungs, eventually transforming into adult amphibians. Their diet primarily consists of algae and plant matter during the larval stage.