Not sure, but if it could be set up, you could have the hedge wall end their turn when they enter it, and have them as not targetable while in it (which would make an interesting additional defensive option- not sure if the damage is too much or not) definitely a cool spell.
Also the tree shield could be renamed something like Heartwood Canopy, as the canopy would be the part to provide the majority of the protection from ranged attacks. Im guessing that spells are a different category and would be unaffected by it.
I wonder if the rat swarm coud be reskinned red/brown and be squirells. Could have them less combat based and have high evade and their successful attack on a unit prevents them from moving (but can still attack?)
The giant eagle would probably go better in a mountain or air theme. What about a killer rabbit (Mad Hare), could have it be 'lightning quick and full of sharp pointy teeth' (ie keep the bypass terrain, change it so it has high dodge on all attacks (but lower on the target attacked), have it have a high crit ratio on its attacks, and only a few HP).
Grabber vine to Shackle vine? Or something trapper/snare related? It sounds like the kind of plant that works similarly to a fly trap, it imobilizes prey (which die from exhaustion, exposure, dehydration, etc. while trapped) and then flourishes off of the nutrients in the remains (and perhaps attracted scavengers for extra prey) Probably polinating with flies or something.
Thorn grass to Butcher's Bramble? (ie a name representing the fact that it does damage, and leaves you horribly exposed and vulnerable to ranged attacks) for extra fun, could have the spell graphic by rusty or glistening red thorned vines. Could grow well with something found in blood, or absorbing it thru the surface area more than the roots? May have some kind of fruit, flower or edible part to attract prey (such as grazing animals) or hunting animals seeking the smaller birds and mamalls (rabbits) taking shelter in it from predators. May spread by having outlying sections being sticker and easy to break off on something brushing past and then attempt to take root wherever they are deposited from there (probably pretty hardy biologicly).
Water Absorbtion has a bland sounding name to me but cool effect. I think there was a technical term for it in biology, but can't remember. It strikes me as a fun spell like Naturalize in MtG (green spell that destroyed artifacts and possibly enchantments as well). perhaps have a blooming flower effect to show consuming the water to promote growth?
The greater blight one could be something to do with a mold outbreak or lack of polination if you are searching for a different name. Or something like a draught (though Im pretty sure that is the wrong spelling).
Perhaps the great bear can knock foes around the field. Potentially tie it into lore (Lady Umber maybe?) or Forest King. Probably want him to be a 1 per battle type at most, at 4x size he could potentially be swapped with the wolf horde for the cast level depending on their relative combat performance.
Lots of great stuff here! Go Planet?