The Knife-Wielding Octopus is a sentient, land-breathing octopus, likely from another dimension than the Prime.
This octopus is one of the shopkeepers of the Interdimensional Black Market, a hub of illicit cross-universal trade. In its stall, the octopus, wielding many knifes thanks to its various tentacles, sold various dangerous-looking foods.
behind the scenes
The Knife-Wielding Octopus is briefly mentioned in the 2019 Crew of the Copper-Colored Cupids story Misadventures in the Interdimensional Black Market.