Jabbermogwai is a ‘Legendary Hunt’ in Borderlands 3. This unique Jabber is a reference to the Gremlin’s Movie. It will multiply when it gets wet, in other words, if you damage it with a Cryo weapon. You need to defeat Jabbermogwai for Sir Hammerlock’s Crew Challenge.
Jabbermogwai is located in the Voracious Canopy on the planet Eden-6.
You can farm Jabbermogwai for these legendary weapons as it is the dedicated loot source for these items. Jabbermogwai has a 15% legendary drop chance. The Hellfire will only drop if you kill Jabbermogwai with an Incendiary weapon.