Frodo went to Mordor and brought back a....

[Hookbill the Goomba]

I don't know what the chapter's called, since I only have it in Swedish.

Of Eldamar and the Princes of the Eldalié

Anyway;

Frodo went to Mordor and brought back Aeglos, Belthronding, a Cavetroll, a Dunadan, Elessar, a Fell beast, a Giant, Maedhros's hand, Ithildin, jibbet, King Theoden, Lobelia, a midge, Narsil, the One Ring, Pipe-weed, Quickbeam, Radagast, the Silmarilli, Turin, Ulumúri, Vairë, a White Tree, the Yellowskin, a chunk of Zirakzigil, the Arkenstone, Black Rider, Celeborn, a dragon, Eä, Fëanor and Galadriel [The Silmarillion, Chapter 6, Of Féanor]