Gwaihir, with his eagle's-sight saw Frodo and Sam as two small, dark figures on a rock outcropping amidst the destruction of Mount Doom.
The direct quote, from The Lord of the Rings: The Return of the King-"The Field of Cormallen" is as follows:
And so it was that Gwaihir saw them with his keen far-seeing eyes, as down the wild wind he came, and daring the great perils of the skies he circled in the air: two small dark figures, forlorn, hand in hand upon a little hill, while the world shook under them, and gasped, and rivers of fire drew near. And even as he espied them and came swooping down, he saw them fall, worn out, or choked with fumes and heat, or stricken down by despair at last, hiding their eyes from death.
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Yes, after Rosie Cotton dies, Sam (who is now about ninety) gives the Red Book to his daughter Elanor and sails across the sea to be with Frodo, which he was permitted to do since he had been a Ringbearer, if for but a short time.
Frodo's friend and sidekick is Samwise Gamgee.
They were close to him, and knew that something was afoot, but not knowing what that was, they had Sam spy on him. (In the book) In the movies, they knew because Sam was roped into it without a choice by Gandalf, and Merry and Pipin knew only beause they ran into him, and desired to help when the saw that danger was following him.
Cracks Of Doom
He leads frodo an Sam towards mordor and slowly turns frodo against Sam. Then when he falls off a cliff after a fight with frodo, we don't see his for a while until Sam and frodo are climbing up the slopes of mount doom. He then attacks them and tries to take the ring. Eventually Sam and frodo escape and are standing on the edge of the lava about to drop the ring into the volcano when gollum hits Sam on the head with a rock and then bites frodos finger off and claims the ring for himsefl, jumping around with joy. THEN frodo attacks gollum an they fight for a bit before they both fall off the edge. Frodo manages to hold onto the rock but gollum, who is holding the ring, falls into the lava and dies.