Moss Hound
Immortal Tree
Ressurects itself within a few rounds with half of health from last time if no creature is on top of the corpse. 5 consecutive turns are required.
There are no corpses. Maybe drop a butterfly that would restore half health the the picker. Could resurrect Moss Hound only if it's not picked up that turn. Won't drop a second time, so the unit will only resurrect once.
Stalagmite Teeth
Pierces nearby foe with it's denture. 20 pierce damage
Could have a debuff, like -1 defense.
Weed Field
Nasty weeds instantly grow at a location within range, damaging and trapping foes depending on their size. 9 pierce + 9 crush + 9 poison < 3 turns
Both trapping and damage might be rather OP. This could have different name and basically just add an obstacle at a target location, which would grow spikes and retaliate to melee attacker(s).
Waterfall Cannon
Powerful jet of water that damages several times, either knocking target back a bit or doing bonus damage. 10 (or double) crush damage x 2 hits
Need to make this ability rather unique and clear. Atm it's a combination of a few others, especially from Snow Bunny.