The most likely answer to both the walking tree Hal saw and the trees that issued forth from the Old Forest is that they, since they are very ancient specimens, were among those tress which are still aware of the mission Yavanna gave them, to protect the olvar, the rooted beings, from the kelvar, the animals and humanoids (apparently, if need arises, also by force).
Or they might simply be trees that have grown 'Entish' over the years, and resemble Huorns now, as was probably the case with such trees as Old Man Willow (notice how his/its (?) age is again eponymous) or some in Fangorn forest.
[ October 31, 2001: Message edited by: Sharku ]
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