Not as whales, no. Marine (sea) mammals (whales, dolphins, etc.) are descended from terrestrial (land) mammals, but they're not identical with those land mammals... among the more obvious changes, they've lost their legs.
The related links section has a link to a Wikipedia page showing what some of the distant ancestors of whales might have looked like.
Hitler was the worst person to ever walk the earth!
The Earth's gravity keeps our feet firmly on the ground.
no one knows this means never ever ever ever ever never
Ever since the earth formed, about 4 billion years ago.
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No. They never had had feet before.
In 2008, scientists discovered the fossils of an animal they believed was an ancestor of today's whales. The unique feature of this animal was that it had legs and possible spent a lot of time on land as well as in the water.
no dinosaurs were
No they did not
yes
You are!
Hitler was the worst person to ever walk the earth!
land mammal
no
no.
the blue whale (answer by karl )
clearly Henry brose