Acid Glants are a natural resource obtained by killing and looting Soldier Ants or Larva.
How to Get Acid Glant in Grounded
Soldier Ants are found around or inside Ant Hills. One such hill is north below the Oak Tree, but you’ll find them to the east and south as well. Explore and keep your eye open and they won’t prove too hard to find.
Remember that the Ants can take some hits because you don’t have a good damaging tool just yet, so try to lure them one by one.
Finding Larva
Larva are found near Spade Gulnch. The cave entrance is blocked by Acorns, so bring your hammer. Be prepared as larva attack as a swarm: if one targets you chances are all will. Once dead you can loot their body for Acid Glants.