Giants?

[The Silver-shod Muse]

Many beings of giant size, both good and evil in nature, lived in Middle Earth. In the First Age of Stars there were the Ents, the Treeherds, who measured fourteen feet in height and were of immense strength and great wisdom. Later came Giants filled with evil; those named Trolls and Olog-hai served the Dark Power and made the wild lands of the World perilous for travellers.
A Guide to Tolkien

So it seems that "giants" refers to large beings in general, Ents and trolls primarily.

Also, in the tales of Hobbits, there were rumours of great giants who, in league with Orcs, guarded the High Passes in Rhovanion.

Perhaps burrahobbit's landslide was the production of the malicious intent of certain trolls, who would have been giants to a man, and certainly so to a hobbit.

[ August 10, 2002: Message edited by: The Silver-shod Muse ]