Goombella: This is a Bristle. He has a tough defense! The health is 2, the attack is 1 and the defense is 4. You can't jump on him or hit him, you should use an item, because he has spears!
When Mario encounters a Bristle, a POW Block is weakness for it. Fire can't destroy the Bristle. Koops can also attack him with his shell. Mario can also use a Star Special to defeat it. The plumber can also equip the Spike Shield to defeat it. Mario can only jump or hit it when he's equipped with the Spike Shield badge.