[Inziladun]

Originally Posted by Kuruharan

I primarily meant in the behavioral and physical outcome sense. Their behaviors in their degraded states had a resemblance.

Hm. Both Wormtongue and Gollum had had occasion to be around Orcs, and possibly observe their culture. Cannibalism seems to have been something they practiced. Curiously, it's presented as something of an insult, as in the quarrel between Saruman's Uruk-hai and the Orcs of Mordor:

'Swine is it? How do you folk like being called swine by the muck-rakers of a dirty little wizard? It's orc-flesh they eat, I'll warrant'

TTT The Uruk-hai

or, a threat to induce compliance, as with Shagrat to Snaga at Cirith Ungol:

'You must go, or I'll eat you.'

ROTK The Tower of Cirith Ungol

Perhaps hearing of, or maybe even watching Orcs eat one one another could have helped inure both to such an act, if it was down to either that or starving.