Is it weird that we always make equivalent of sea creatures based on land things which often totally unrelated?
Sea hare (while it's a Gastropod)
Sea cucumber (totally not some aquatic plant)
Sea lion (meow)
Sea lily (another animal)
I think if we made a fantasy story about civilization underwater, they'd refer at land animal and creature same way.
Elephant: land whale
Cockroach: land isopod
Panda: land orca
Grass: land algae
Cucumber: land holothuroidea plant
And so on...