Mokumokumo

Mokumokumo (モクモクモ) is an enemy from Mega Man & Bass, a small robot head that is surrounded by a cloud of smoke. If a Mokumokumo touches Mega Man or Bass, it will interfere with their jumping, making it difficult to avoid enemy attacks and obstacles such as pitfalls. They appear in Tengu Man's stage, as well as King Stage 3. The Oni Robos in Tengu Man's stage and Cold Man in his boss fight can summon them.

Etymology
Its name is probably a combination of the words, "mokumoku (モクモク)" and "kumo (雲)". The former is Japanese onomatopoeia of billowing smoke or cloud. The latter is Japanese for cloud.