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I'm answering your questions.
1. I recently noticed a contest here and just decided to participate...
2. Children of the Sea can move on land: Mermaids crawl, and the warriors move by leaning on their tridents. Crab people and crayfish move quickly on any surface. The Wonder moves slowly due to its weight... The Amphisbaena, like any snake, crawls by wriggling its entire body. Unicorns do something like jumps. The octopus slides like the one-eyed creature from the Dungeon used to. And the dragon (since it has no wings) skillfully "runs" across the field.