The first time I've heard the word PINGAS, was a video with SEGA logo bloopers. Among them was the word GAS, which was followed by PINGAS. After this I've started to think that this is some kind of pin-related gas.

In DELTARUNE, Queen gives Noelle the Royal Pin, and orders her to create another Dark Fountain.

In the end, Kris manages to create one, which looks like a black gas after the opening.

Morefore, the King, who also idolizes the Dark Fountains and their creators, is jokingly compared to Robotnik. He was never fighting the Lightners before they reach the final room, instead just sending various henchmen against them.

Does that mean that PINGAS is actually a Dark Fountain?