Splat Bomb
From Inkipedia, the Splatoon wiki
The Ink Bomb is a Sub Weapon in Splatoon
When thrown, upon touching the ground, it explodes and coats the area in its team's color. There are three types of ink bombs. Number one: burst bomb. A large balloon filled with ink, that explodes on impact. Number two: proximity mine. This is the triangular shaped one. It will explode after a short time or when someone walks near it. Number three: suction bomb. This one is baisicly the proximity mine eccept for the fact that it looks like the bottom half of the in barrier, and can stick to walls, celings, etc.