Tap-Tap

Tap-Taps are small, spike-covered enemies that walk back and forth in Super Mario World 2: Yoshi's Island. The silver ones walk off of platforms, unlike the pink ones, but this arrangement was reversed in Yoshi's Island DS. Sometimes they'll hop up and down. They can't be hurt in any normal way, except for an egg. A Huffin' Puffin chick will send one flying backwards, and if it hits another, the other one will be destroyed. They're immune to most attack, except ice breathe and fire breathe, a Tap-Tap is encountered as a mid-boss in Super Mario World 2: Yoshi's Island as Tap-Tap the Red Nose, as well as a similar obstacle in Baby Bowser's castle known as Tap-Tap the Golden.

Tap-Taps have also appeared in Yoshi's Universal Gravitation, Yoshi Touch & Go (whose manual erroneously labeled them as Spiked Fun Guys, which are actually a different species), and Yoshi's Island DS, where they behaved similarly; however, instead of the normal ones walking off platforms, the pink ones walk off while the normal ones stay. A large, invulnerable variation (with the ability to crush land platforms) known as the Super Big Tap-Tap also appears in Yoshi's Island DS.

Appearance
Tap-Tap is a boulder-like spiked creature with two eyes and an grin, it also has a bulbous red nose, Tap-Tap are immune to most attack, except Special Blue Watermelon and Super Red Watermelon.

Notable Tap-Taps

 * Tap-Tap the Red Nose
 * Tap-Tap the Golden
 * Sorbetti (Possibly?)

Trivia

 * Spiky Tromps and Spiny Tromps look very much like Tap-Taps; they are also round and covered in spikes.
 * The boss Sorbetti, from Super Mario Galaxy 2 looks like it may be a large Tap-Tap made out of snow.
 * The name of Tap-Taps may come from the distinctive clicking noise they make as they walk.