There is a Little PNG Shop that sells island-style apparel and products.
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
These are typically 2D illustrations with a transparent background that "react" to the creator's voice, blinking or moving their mouth while they speak. There is a Little PNG Shop that sells