With that said. Here are a few thoughts:
Warped Wood: Here, something has caused the inhabitants to change. The animals are deformed or have monstrous or magical qualities. Strange entities stalk the trees that whisper or eat on men. Those few that delved into the forest and came back have been changed, for the better or worse (depending on how you ask them). Has the Far Realms bled over here? Or has something else tainted this area (Scarred Lands has a forest corrupted by the tooth of the glutton titan, turning all the animals mad and savage).
Thorn Hollow: Old when the land was young, the spirit that lives in the heart of this forest has been sated by worship and sacrifice. This place earns its name from the hedges and walls of thorns that shift and change within it, offering an impenetrable field for the unwanted.
The Thorn Hollow has been a sanctuary for those that must hide, be protected from the ravages of civilization. Refugees and the hunted have been granted protection here. The forest's spirit has only three edicts: 1) By offering a penance of one's own blood, one may stay unmolested for one full moon and no less. 2) Desecrate no tree, animal, or entity within; take only that which has fallen. 3) Bring no violence from within; any given protection cannot attack another who has the forest's protection.
Failure to do any of these result in being hung from the thorns and jagged branches, bled dry in the center of the wood.
The Bone Orchard: The trees are ghostly pale, their branches barren of leaves even in the heart of summer. At the ends of the branches, boney protrusions that look like skeletal fingers extend, and in fall, fruit shaped like skulls hang (it is rumored the fruits are used only for brewing poisons). Even during the day, the shadows are deep and long beneath these branches, and the air is filled with an uncomfortable cold that is soul deep. Ravens are the most common inhabitant, perching in the trees en masse to watch any that pass within.
There is a strong connection to the Shadowfell here; in order to travel to the Shadowfell, one must be buried at the foot of a tree at dusk, and crawl from their "grave" once the sun has dropped. The same process is repeated at the time of "dawn" to return. Entities of the Shadowfell often cross over here, or lurk within the thickets.
Despite the macabre exterior, the place is not inherently dangerous or deadly. The witch who lives within this place holds sway over a long-standing pact; any that seek to travel to and fro, or bring violence against another within the wood must first gain her permission, or seek her wrath. Thus, the Orchard is often a site of trade, transition, and neutral ground. Every year, a festival of sorts is had, although the nature of that is not often spoke of. Legends say that the wood of the trees is used to create weapons that effect incorporeal, undead, or shadow-based foes, but to chop a tree requirse blessing from the witch.