Shark Fishing Carolina Beach

South Carolina square black fish with four “tentacles”?
Walking across the beach in my husband’s town in South Carolina tonight. We came across some kind’ve black square fish(shellfish? shark?) dead on the sand. It seemed to have tentacles at each corner. I’ve been searching the internet for it for about an hour now, no luck, not even on google. Does anyone know what this might be?
Might have been a decomposing catfish and the tentacles may have been whiskers or a Sea Robin.
Pier Fishing At Myrtle Beach, Catching Sharks
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