Incoming Chomp

Incoming Chomps, also referred to as Giant Wan Wan in one preview, are chainless Chain Chomps first appearing in Super Mario World 2: Yoshi's Island. They jump from the background hills and destroy everything below them. They also seem to be unlimited in number, or they return to the hill after jumping. They appear only in certain levels, in areas marked with signs depicting them. A Yoshi does not lose Baby Mario when hit by one of them. Chomp Rocks, which are stones in the shape of Incoming Chomps, also appear.

The appearance of these enemies is different between the original SNES game and Yoshi's Island: Super Mario Advance 3, in that the reflective shine is no longer on both sides, and their teeth are shaded on the other side. This is actually made from graphics that were present but unused in the original, likely to save on active sprite tiles due to the number renderable at a time being limited.

Incoming Chomps reappear in Yoshi's Island DS, where they function identically to the first game. A smaller variation called a Bound Wanwan also appears, and it bounces around the stage, attempting to smash a Yoshi.

In Yoshi's New Island, Incoming Chomps are replaced by Fire Wanwan Dosun that function similarly.

In the Booster Course Pass DLC for Mario Kart 8 Deluxe, Incoming Chomps can be seen jumping in the background of the Yoshi's Island course.

Super Mario World 2: Yoshi's Island

 * Shogakukan guide: ワンワンが巨大になって帰くから飛んできて、地面に大きな穴を開けて落ちてゆく. (A huge Chain Chomp jumps from its home, falls and makes a big hole in the ground.)
 * Player's Guide: Their razor-sharp teeth aren't as dangerous as the huge craters they make when they hit the ground.

Yoshi's Island: Super Mario Advance 3

 * Shogakukan guide: 遠くから飛んで来て、地面に大きな穴を開けながら落ちていく. 着地の直前に地面にかげができるので注意しておこう. (It jumps from far away and falls down, making a big hole in the ground. Be careful because a shadow appears on the ground just before it lands.)