A walrus can get up to 4400LBS, but the large side of average is about 3700LBS. A hippo averages on the large size 3310LBS In mid-level water… If the hippo's feet can touch the bottom enough that it can run, then it will probably win. read more
The walrus. Obviously the walrus would win in the water if forced to fight (although it would probably like to just swim away). On land, the walrus has a lack of mobility, but a wombat that large would probably have mobility and joint problems as well. read more
Not to mention that Polar Bears are known for killing Walrus, some of which are adults weighing 4,000 pounds. The average adult Hippo weighs 3200-4000 pounds. Polar Bear can win this. read more