I found this creature concept on the DeviantART page of German artist Malte J. Zirbel (aka PointLineArea).
Although the creature has been named “Swamp Rabbit”, it doesn’t look much like a rabbit at all – it doesn’t have floppy ears, and from the look of those sharp teeth it’s safe to assume it eats something other than grass. Perhaps the name is instead a clue as to how the creature moves – using that large rear foot to hop short distances.
Those large, flat front feet have surely evolved to help spread its weight on soft, swampy ground, but they likely also prevent the Swamp Rabbit from moving particularly fast. Perhaps it evolved on a high-gravity world in which stability is more important than speed, and in which the animals at the bottom of the food chain are equally cumbersome.
Another possibility is that it could be an ambush predator, using its powerful rear foot to dig traps in the soft swampy ground, or hiding in ponds and rivers like a crocodile.
Artwork by Malte J. Zirbel (aka PointLineArea).