I agree with the topic starter.
Saruman was showing his contempt for Wormtongue both by calling him "Worm", and by insinuating the cannibalism. Wormtongue's protest that Saruman "made him do it" referred only to the actual murder of Lotho in his sleep.
Debased as Wormtongue was, I wouldn't think he was fallen enough to eat a Hobbit out of an Orcish evil, or that the food situation at Bag End was that bad.
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