Your blowgun can be crafted from two bamboo side-by-side, and darts can be crafted from a single bamboo.
A dart pouch can be crafted from string, leather, and 3 darts. These act like Bundles, but can only store darts. They can also be equipped to trinkets and curios slots, and will render on the player when equipped to these slots.
Darts can be crafted with lingering potions to make Tipped Darts, just like tipped arrows.
Three enchantments are added that are specific to blowguns:
