A crocodile with heavy stony hide that hunts waterway shallows

A Cragodile is akin to a normal crocodile but with a heavy stony hide. Unlike its relatives, a cragodile may be found in virtually any climate. It hunts the shallows and banks of waterways, remaining submerged until prey comes within reach and surprising on 1-4 on 1d6. Because of a cragodile's exceptionally hard skin it takes half damage from piercing or edged weapons. A cragodile is significantly heavier than its normal kin and does not actually swim. The swim speed listed is actually more of a "run" speed along the bottom of a waterway which it can navigate as easily as dry land.