>>51122619they already have vestigial hind legs. But to answer your question, no, probably not. Evolution can result in a huge diversity of forms, but it can only build off what has come before. At certain points of divergence you cut yourself off from certain possibilities. So its very unlikely that whales might grow back their former legs. But evolution could see them maybe turn their tales into a walking implement, should they experience evolutionary pressures to return to land.
