Bramble

Life-Tether Stride.
At the end of the Rootfox’s turn, one allied creature of its choice within 10 feet regains 3 hit points, provided the Rootfox moved at least 20 feet that turn.

Verdant Agility. 
Bramble ignores nonmagical difficult terrain created by plants. Opportunity attacks against it are made with disadvantage while it is in natural terrain.

Multiattack. 
Bramble makes two Rooted Bite attacks.

Rooted Bite.
Melee Attack Roll: +5, reach 5 ft., one target.
Hit: 5 (1d6 + 2) piercing damage plus 2 (1d4) poison damage.

Verdant Dash (Recharge 5–6).
The Rootfox moves up to its speed without provoking opportunity attacks. Each allied creature whose space it passes through regains 5 hit points (each creature can benefit once per use).

Flickerstep.
When targeted by an attack it can see, the Rootfox halves the damage on a hit and moves up to 10 feet without provoking opportunity attacks.