Cave Spiker

False Appearance: It looks like a normal plant or fungus until it starts attacking (which protrudes its spikes).

Projectile Venom Thorn. Ranged  Attack: +3 to hit, range 60/120 ft., One target. Hit: 4 (1d6 + 1) Piercing damage. If it hits, the target makes a constitution saving throw (DC 11). The target takes 1d2 poison damage each turn this is in affect. The target may repeat the saving throw once each turn.

Melee Spike. Spikes extend from the spiker, all creatures adjacent to it must make a dexterity saving throw (DC 11) or take 1d6+1 piercing damage.

Hook Vine. Ranged Weapon Attack: +3 to hit, Range 20/40 ft., One target. Hit: 1 Piercing damage. The target makes an acrobatics or athletics check against the attack roll total used to hit the target. The target is grappled if failed. The spiker immediately reels in the vine whether it hits or not.

Seed. The target must be grappled by the spiker. The spiker injects spends an action to inject the target with its seeds. The target makes a constitution saving throw (DC 11) or get infected with the spiker seeds. Being seeded counts as a disease. They slowly transform into a spiker spawn in the span of about a week. (Link to the Spiker Spawn monster is in the comments)