Valheim's Deep North is a dangerous biome, but does anything spawn there? There's a short answer to this question, but first, we must establish some things about the Deep North as a map.
Valheim Deep North: Is There Any Monster Spawns?
The Deep North, as of now, is a work in progress. While some players have experienced the biome first-hand, it's missing a lot of content. It lacks resources, except for mounds of rock here and there, and it has ice sheets that float along the shores. It can transition into a Mountain biome, if the altitudes are high enough, and while some creatures can go back and forth the borders of adjacent mountains there are no confirmed creature spawns in the Deep North.
As such, there are no monster spawns to be concerned about. But this goes back to the first point: the Deep North is still in development. A new set of patch notes was released on April 19, and while they did not mention their plans or any updates regarding Deep North, players will have to wait for more content to be added to this map.
If you do wish to explore the depths of this biome, make sure you bring craft some Frost resistance mead before traveling to the biome. Wolf Armor in addition to a Lox or Wolf fur cape could assist you in preventing any freezing damage, also keep campfire materials with you at all times.