I think it is obvious that, in the film, Frodo can communicate with Galadriel through thought. Likely this is Galadriel's ability, not Frodo's but don't try and fit the film and the book together this closely. It's like trying to bang a square peg into a round hole.
H.C.
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"Stir not the bitterness in the cup that I mixed myself. Have I not tasted it now many nights upon my tongue, foreboding that worse yet lay in the dregs."
-Denethor
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