Fish (item)

The Fish summons a pet baby penguin to follow you. Using the item does not consume it, and it will remain in your inventory while the penguin is active. You can despawn it by right-clicking on the buff icon. Fish are found randomly inside Ice Chests in the Underground Snow biome.

If you jump too high into the air, the penguin will fly after you. The baby penguin is immune to damage from enemies and despawns upon player death.