Dreadbloon: Armored Behemoth/BSM2 Mobile

Dreadbloon: Armored Behemoth is a Boss Bloon that can appear in Bloons Super Monkey 2 Mobile. It has about 29,000 health. Once popped, it spawns a multitude of Yellow Bloons, Lead Bloons, and Ceramic Bloons. The Rock Shield has 14,000 health, can spawn twice throughout the level and pops into Ceramic Bloons. It ONLY appears on Level 75.

Trivia

 * Despite the BTD iterations making the Dreadbloon immune to sharp objects, it doesn't apply to this game.