Now depending how much you want to stick with PJ's/GW's vision of Lord Of The Rings this may not be for you however there are some great miniatures currently up on Kickstarter that would do a fine job as Hobbits and Trolls, they're in the add ons section of the Dwarves at Arms campaign by Macrocosm Miniatures:
https://www.kickstarter.com/projects/20 ... es-at-arms![Image](https://ksr-ugc.imgix.net/assets/014/028/506/68b0d5f953df4ee34e49869df1edbd6b_original.jpg?w=680&fit=max&v=1475914617&auto=format&q=92&s=359e174b48bed35a93a49291af1b2c0f)
![Image](https://ksr-ugc.imgix.net/assets/014/023/351/6f8cdb491ad5a85fc75c0ab523623c40_original.jpg?w=680&fit=max&v=1475870324&auto=format&q=92&s=dee64e8edb1e32ceb06a0263132e97e2)
There's a wide range of various halflings available and the price for them is such that you'd be mad not to chip in for some just to see how they look.