"Fathead"? I think that's more specifically a "blobfish" (Psychrolutes marcidus).
It's blobby because it uses gelatinous goo instead of gas bladders for flotation (gas bladders don't work so well ~1000m down...). They just float there in the dark and wait for food to drift by. Sort of the couch potatoes of the fish world, I suppose. Hmm, maybe that's where most of those overboard Doritos disappeared to?
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