The Giant Rocktopus described in Out of the Abyss (p.28) is said to be a Giant Octopus that evolved to live on land.
It has a walking speed of 20 feet and a climbing speed of 10 feet.
Nothing is mentioned about a swim speed, though. Does this mean the Rocktopus has the Giant Octopus 60' swim speed, or did it lose its ability to swim entirely?
This matters a lot if a Druid tries to Wild Shape into the Giant Rocktopus.