Chonk Stomp is located in Floodmoor Basin on the planet Eden-6. He can be found in a small arena that is a short distance from the ‘Primeval Grotto’ area. It’s between the entrances to The Anvil and Blackbarrel Cellars.
You can farm Chonk Stomp for these legendary weapons as they are the dedicated loot source for these items. Chonk Stomp has a 10% legendary drop chance.