Yukidarubon

Yukidarubon (ユキダルボン) is a small robot snowman enemy in Mega Man X4 that appears in Frost Walrus's stage. It virtually has no significant purpose, other than to hurt enemies that touch it and then self destructing upon landing flat on its face.

Other media
Yukidarubon had a brief appearance in Sonic Universe #76.

Etymology
Its name is probably a combination of the words, "yukidaruma (雪だるま)" and "bon (ボンッ)". The former is Japanese for snowman. The latter is Japanese onomatopoeia of explosion.