Chomp Call

The Chomp Call is an item which appears in Mario Party 4 and Mario Party: The Top 100. It is a Chain Chomp-shaped whistle that calls four small Chain Chomps to surround the host and Star Space of the board, and scares both them and the Star Space away to another space. It is similar to the Lucky Lamp from Mario Party 3.

Chomp Calls are also used in the minigame Chomp Romp from Mario Party 5.

Official description from Mario Party: The Top 100
Chomp Call:

Tie Chain Chomp to the Star Balloon and see where he drags it!