Crushjaw - Borderlands 3 Farming Guides
Location: Cathedral of the Twin Gods on Pandora
Part of: Crew Challenge
Drops: Whiskey Tango Foxtrot (Shield) and Jericho (Vladof RPG)
Crushjaw is found on Pandora in the Cathedral of the Twin Gods zone; one of the final zones you go through towards the end of the game. Right after you drop down into the Eridium Sluice towards the end of this zone you'll want to turn around and go up the stairs. You'll find Crushjaw in this area - he's relatively easy to find.
As far as loot goes, Whiskey Tango Foxtrot (Shield) and Jericho (Vladof RPG) are both on Crushjaw's drop list and have a higher chance of dropping from him than from other enemies. Both of these items do drop from other enemies though, they are not unique to Crushjaw.