Well in TTT Frodo sees Gollum as he is, a creature who is dealing with a continuous inner conflict. He also sees that Gollum has a chance to turn back to good. However, the problem is that he never sees the change that occurs within Gollum which takes place right at the end TTT in the final scene.
Sam simply becomes more suspicious then he was before. He might have noticed the change but I am sure.
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