Swamp slugs were a type of being that naturally lived in the swamps located on the planet of Dagobah; they were a native species there.
These creatures possessed an oesophagus packed with numerous teeth, numbering in the thousands, which allowed them to pulverize both plants and animals. However, these teeth were ineffective for consuming droids. Swamp slugs produced a slime that was highly sought after by both chefs and bartenders, who valued it as a syrup.
Luke Skywalker encountered a swamp slug while undergoing his Jedi training with Yoda in the year 3 ABY. The Dagobah Slug Slinger was an alcoholic drink offered at Oga's Cantina, which is situated in Black Spire Outpost on Batuu. This cantina used slime obtained from swamp slugs, kept in tanks behind the bar, to sweeten the cocktail. Artiodac chef Strono Tuggs developed a substitute slime formula known as Dagobah Slug Syrup, which he included in his cookbook titled The Official Black Spire Outpost Cookbook, along with the cocktail's recipe.