Wall Lakitu

Wall Lakitus are the land-dwelling equivalent to Aqua Lakitus that stay on a perch at a particular point. They hide behind walls and throw Spiny Eggs at Yoshi. The Lakitu may be defeated by being jumped on or shot by an egg. They never ride clouds or leave their wall's holes.

Wall Lakitus appear in Super Mario World 2: Yoshi's Island, Yoshi's Island: Super Mario Advance 3, Yoshi Touch & Go, Yoshi's Island DS, Yoshi's New Island, Yoshi's Woolly World, Poochy & Yoshi's Woolly World and Yoshi's Crafted World. In Yoshi Touch & Go, they primarily appear later on in Marathon Mode; their Spiny Eggs can be destroyed with eggs, though they cannot be defeated by drawing bubbles around them. In Yoshi's New Island, they first appear in Hidey-Hole Hooligans as the prominent enemy of the level where their Spiny Eggs can break through destructible terrain.

Super Mario World 2: Yoshi's Island

 * Official Nintendo Player's Guide: Original members of the Hole-in-the-Wall Gang, their shifty eyes always give them away.

Yoshi Touch & Go
(They emerge from holes in the wall and throw spiked bullets. Since you cannot wrap bullets in bubbles when they are in your possession, it is better to aim at them with an egg. Touch the flying bullets or shoot them down with an egg.)
 * Shogakukan guide: 壁の穴から顔を出し、トゲのついた弾を投げてくる. 弾を持っているときはシャボンに包めないので、タマゴでねらったほうがよい. 飛んできた弾は、タッチするかタマゴで擊ち落とそう.