Tortle

Tortles have a saying: “We wear our homes on our backs.” These turtle folk live on many worlds, most often journeying up and down coasts, along waterways, and across the sea. Tortles don’t have a unified story of how they were created, but they all have a sense of being mystically connected to the natural world. Carrying their shelter on their backs gives tortles a special feeling of security wherever they go, for even if they visit a far, unknown country, they have a place to lay their heads.
Tortles exhibit the same range of coloration and patterns found among turtles, and many tortles enjoy adorning their shells in distinctive ways.

-description courtesy D&D Sourcebooks/D&D Beyond