What was Frodo's temptation

[Inziladun]

Frodo said things on at least a couple of occasions that might have given hints as to his desires.

I should like to save the Shire, if I could...

FOTR The Shadow of the Past

I tried to save the Shire, and it has been saved, but not for me.

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.