Runic mute. Since a chole dragon has runes covering its body that allows it to cast spells and have the extra tentacle appendages the price is that they may never vocalize making them effectively mute. 

Tentacles. The chole dragon has a random amount of tentacles determined by 1d8 this number doesn't decrease or increase as they age but does determine their innate spellcasting. 1-2: four tentacles, 3-4: seven tentacles, 5-6: nine tentacles, 7-8: thirteen tentacles. 

Innate Spellcasting. The young chole dragon's innate spellcasting ability is Wisdom (DC 13, +5 to hit with spell attacks). The young chole dragon can innately cast the following spells, requiring no material or verbal components:

four tentacles: 3/day: fly (self only)

1/day: magic circle (only effects lawful creatures)

seven tentacles 3/day: slow

1/day: fly (self only)

nine tentacles 3/day: fireball

1/day: dispel magic 

thirteen tentacles 3/day: magic circle (only effects good creatures)

1/day: haste 

Multi attack. The young chole dragon makes how ever many tentacle attack it has tentacles for or makes a bite attack and two claw attacks. 

Tentacle. Melee Weapon Attack: +3 to hit, reach 15 ft., 1 target. Hit: 3 (1d6) bludgeoning damage. 

Bite. Melee Weapon Attack: +7 to hit, reach 10 ft., 1 target. Hit: 15 (2d10 + 4) piercing damage. 

Claw. Melee Weapon Attack: +7 to hit, reach 5 ft., 1 target. Hit: 11 (2d6 + 4) piercing damage. 

Insanity gas breath (Recharges 5/6). The chole dragon exhales insanity vapors, each creature within 30ft cone must make a DC 14 Wisdom saving throw or have their Charisma or Wisdom stats reduced by 1 (which ever is higher) and also make a DC 14 Constitution saving throw or take 52 (8d12) poison damage. On a successful save a creature takes half damage and the stat reduction can be reversed by a creature taking a long rest (1 point regained per long rest).