Frodo said things on at least a couple of occasions that might have given hints as to his desires.
Quote:
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I should like to save the Shire, if I could...
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FOTR The Shadow of the Past
Quote:
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I tried to save the Shire, and it has been saved, but not for me.
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ROTK The Grey Havens
Perhaps the Ring finally convinced him that the only way to ensure the Shire would survive was for Frodo to claim it and return there.