Chain Chomp

 Chain Chomp is an enemy found in Bob-omb battlefeild. When Mario or Luigi come near it, it will bark and try to barge into you. It is invincible, but if you ground pound on the stake that holds it, it will dance, break open the gate and revealing a Power star, and jump away. You can stun it by throwing a Bob-omb at its head. They will cause much damage to the player, and it will cost you 3 chunks of your Power meter.

Piranha plant