Fugu gray

Quick answer：

Fugu gray refers to the color of the pufferfish, which is often characterized by a pale, grayish hue. Pufferfish, also known as fugu, are marine fish found in warm-temperate and tropical seas around the world. Their distinctive feature is the ability to swell up with water when threatened, making them one of the most dangerous fish to handle due to the presence of tetrodotoxin in their bodies. The gray coloration is a form of camouflage and helps them blend into their underwater environment.