Frost fish, also known as smelt, are small freshwater fish that inhabit cold water regions. These fish are popular for their mild taste and delicate texture. However, there are several other synonyms one can use to describe these fish. Some of these include ice fish, silver smelt, and rainbow smelt. These fish are often referred to as ice fish due to their preference for colder water. Silver smelt is another term commonly used to describe frost fish due to their silver coloration and elongated shape. Rainbow smelt is also used to describe these fish because their iridescent scales can sometimes appear rainbow-like. Regardless of the synonym used, frost fish are a delicious and popular choice for many anglers and seafood lovers alike.