What type of fish is a baby fry?

"Baby fry" isn't a type of fish itself, but rather a stage in the life cycle of many fish. It refers to the newly hatched, young fish before they develop into juveniles and adults.

So, the type of fish a baby fry is depends on the species of fish it hatched from. For example, a baby fry of a salmon would be a salmon fry, a baby fry of a guppy would be a guppy fry, and so on.