I’ve added figures that were not technically from a 1:18 scaled line but can work well in a 1:18 scaled display.
Frodo in Orc disguise – He doesn’t work as a 1:18 hobbit but give him an orc head and he would make a great 1:18 orc.
Samwise in Orc disguise – He would also be a good base figure for an orc custom.
Treebeard – He comes in 3 different sizes. 8 inches, 12 inches, and a giant 17 inch one.
Here is the 8″ one next to a 6″ Lord of the Rings figure by Toybiz.
Here is the 12″ figure with some hobbit statues on his shoulder.
And here is the 17″ Electronic version
The Lord of the Rings line by Tobiz also had 3 versions of 
Battle Troll
Armored Battle Troll
Shelob
Fell Beast
Warg
NECA 24″ Balrog
