I'm about 99.9 percent sure that they are carnivores
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No, they are carnivorous. They eat shellfish. They have powerful muscles that can crush the shell of any crustacean or mollusk so they can devour the flesh on the inside. They prey upon and eat small crabs, scallops, snails, fish, turtles and... other octopuses.
An octopus is a carnivore, dining mainly on shellfish and crustaceans.
The book "The Kingdom of the Octopus," which the author defines as a scientific report in layman's terms, mentions that some natives on Pacific islands have reported occassionly startling an octopus out of a fruit tree.
Octopuses are mostly carnivores, although some species are omnivores. For the most part an octopus feeds on clams, mussels, shrimp, crab, and things of those size.