Frogs can regrow amputated limbs after being treated with mix of drugs: ome unusual creatures have an innate ability to regrow a limb: salamanders, starfish, crabs, lizards and newts. Such extraordinary powers elude most animals, including humans, although scientists have long sought to understand and replicate them in a quest to regenerate limbs for millions of patient amputees, including diabetics and victims of trauma. Now, researchers in the United States said Wednesday they were able to trigger the regrowth of an amputated leg in a type of African clawed frog (Xenopus laevis), in what they described as a "step closer to the goal of regenerative medicine."