When do Merry and Pippin find out about what happened to Frodo and Sam? Where were they, and who told them? Merry and Pippin were captured by Orcs after the Fellowship was broken at Parth Galen.
Maybe I've missed it but seems like this is not made clear. Gandalf finds out from Aragorn and his companions when they meet him in Fangorn but who tells Merry and Pippin?