It’s an alternate timeline where Jessica had a daughter instead of a son and Leto defeated the Harkoenens during their invasion, so Leto rules over Arrakis for the indefinite future, leaving space in the story for fetch quests and base building. Apparently the fremen disappeared too, so you have to solve the mystery.
If my dogs are any indication, they would wear a recently deceased squirrel as a coat, entrails and all, preferably dripping blood.