False Appearance. While the tree remains motionless, it is indistinguishable from a normal tree.
Actions
Slam. Melee Weapon Attack: +6 to hit, reach 10 ft., one target. Hit: 14 (3d6 + 4) bludgeoning damage. An awakened tree is an ordinary tree given sentience and mobility by the awaken spell or similar magic.
Senses: passive Perception 10. Languages: one language known by its creator. Speed: 20 ft..
RollQuest ships the D&D 2014 SRD as a content pack, on a 5e character sheet that does the maths - roll from the sheet and let the numbers work themselves out. Free to start.