In mobile, if you tame them they will build up up to 100 paste in its inventory (make sure to collect it so it makes more, it stops making paste after 100 is in its inventory.) and it will also make organic polymer in its inventory. (Make sure to collect it so it’ll make more.) just level up its food, so that it only needs 1 cake a day.
Just find a couple wild ones then pick up with a flyer then put in a pen. Will excrete achatina paste still without taming. Also these guys can drop angler gel in mobile so, hunt them. More common in the redwoods and swamp junction.