Aspect of the Beast (Crocodile) is a passive Wildheart Barbarian feature that infuses you with the swimming agility of a crocodile.
Description
The Aspect of the Crocodile increases your agility in the water.
Your Movement Speed increases by 
3 m / 10 ft while standing in water-based surfaces.
On slippery surfaces, you also have 
Advantage on Saving Throws against being knocked 