Once they have 100 achatina paste in their inventory, they will start producing organic polymer, I believe they make like 10 stacks of 10 organic polymer as their max, so if you want quick polymer for the morning that lasts twice as long, give them 100 achatina paste
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.