ノコノコ
Noko Noko
"noh-koh-noh-koh"
It means unconcernedly or nonchalantly.
There's a few instances where you can see this Japanese name slipping through the localization cracks. Super Mario RPG has the NokNok Shell weapon. The strangely unlocalized enemy names of Super Mario Land include Nokobon (as in bomb-Koopa) and then Super Mario Land 2 got the Noko Bombette, which even throws in the Japanese name for Buzzy Beetle, Metto (from helmet, "herumetto")!