Tap-Taps are small, metallic, spike-covered enemies that appear heavily in the Yoshi (series) that walk back and forth, making a distinctive clicking noise as they do. They have large noses and grins and small eyes.
Tap-Taps are immune to most direct attacks; if Yoshis attempt to eat a Tap-Tap, they only push the enemy slightly with their tongue. The enemy is also resistant to Yoshi Eggs and Huffin Puffin chicks, although they will be sent rolling backwards if hit with one. To defeat a Tap-Tap, it has to collide with another enemy while rolling. Chomp Rocks, ice breath and fire breath attacks are also capable of defeating a Tap-Tap. Forcing a Tap-Tap into the lava or the water can result in it burning away or drowning. There are two color variations seen in Tap-Taps: gray ones with orange noses and purple feet (which they always stay in the platform they are standing), and orange ones with green noses and blue feet (which can fall off platforks and only turning around after bumping into walls).
A boss called Tap-Tap the Red Nose appears as the second last boss, who must fall into lava to be destroyed. Another similar giant Tap-Tap, Tap-Tap the Golden, appears throughout one of the four doors in Bowser's Castle.
Tap Taps also appear in Yoshi Topsy-Turvy, Yoshi Touch & Go, Yoshi's Island DS, Yoshi's New Island, Yoshi's Woolly World, and Yoshi's Crafted World.