I would say Wormtongue at that stage was capable of cannibalism but only as a last resort, and once the murder victim disintegrates enough to be unrecognisable. I see him more as feeding on rotten stuff, being forbidden to touch Saruman's food, which would prompt the comment.
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You passed from under darkened dome, you enter now the secret land. - Take me to Finrod's fabled home!... ~ Finrod: The Rock Opera
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