tailed frog: western North American frog with a taillike copulatory organ
frog: any of various tailless stout-bodied amphibians with long hind limbs for leaping; semiaquatic and terrestrial species
vat dye: a water-insoluble dye that is applied by reducing the dye to an alkaline form, applying the dye, then regenerating the insoluble dye by oxidation in the material; used for dyeing cotton