Kwang Il Kim
Yes, but there is no benefit to doing so. In fact, as long as the Fellowship remains there the Shadow player will receive a Hunt re-roll for the Stronghold.
While reading the text on the "Balrog of Moria", I found a little difference.
The discard effects of "Worn with Sorrow and Toil" and "Flocks of Crebain" state the below:
"You must discard this card from the table immediately if the Fellowship is declared in a Free Peoples City or Stronghold controlled by the Free Peoples player."
But ones of "Balrog of Moria" "Ignore any “Reveal” icon on the drawn tile if the Fellowship has been declared in a Free Peoples City or Stronghold."
I was wondering if it was an erratum or an intention.