The Lion, the Witch, and ... the Sea Jotun's Ship.
Not that many elements of The Chronicles of Narnia aren't already from Norse Lore, given CS Lewis' Anglo-Saxon heritage and his mutual workshopping by co-Inkling writers' group peer JRR Tolkien whose own series draws its scope from love of that same Lore. So on top of that, note the visual origin of the Dawn Treader: The above illustration found in Annie Klingensmith's Stories of Norse Gods and Heroes from 1894 CE finds visual continuance on every cover of Lewis' eponymous The Voyage of the Dawn Treader in 1952 CE and within the later TV & film adaptation . The Elliði, anglicized into Ellida, is originally a ship seized from defeating its trollish captain in the Saga of Thorstein Vikingsson (ch 23) and characterized as a huge vessel yet super fast, with planks magically grown together, and semi-sentient enough to obey given verbal commands. The Dawn Treader being The Elliði aside, it's not like Eustace getting all treasure happy over a golden armring