Depending on the context where you saw the name, it could also refer to:
The name doesn't appear to be a famous or viral image on its own, but it most likely refers to a PNGTuber model —a common tool used by content creators who want to stream without showing their real face. What is a "Little PNG" Character? LittleLi4.PNG
They are a popular, budget-friendly alternative to complex 3D VTuber models, allowing artists to showcase their OC (Original Character) designs. Depending on the context where you saw the