Willis McNelly documented how these creatures produced a cinnamic acid-derived biopolymer that appears deep blue. A larval form of these creatures act like leeches and are named for resembling trout. Bile expelled by these creatures as they drown in water is ingested in a ritual to become a Reverend (10[3])Mother. (10[2]-5[1])These creatures are impaled (10[1])with (10[1])Maker (10[1])Hooks after they are attracted using an egg-shaped thumper. These creatures, which are called Shai-Hulud and are ridden by Fremen, guard a psychedelic fungusoid nicknamed spice. An odd 2024 popcorn bucket depicts the massive mouth of, for 10 points, what creatures that roam the planet of Arrakis in Dune? ■END■ (10[1])