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The complex theory:
Sam never told Merry and Pippin because it's not really a subject that crops up often. "Hey Sam, have you seen any walking trees recently?
If you thought that was simple... the simple theory:
Tolkien forgot about it. Posibly he put it in intending to have some connection to the Ents or some later relevance and then forgot. He was only human, after all, despite contrary opinion.
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