Can I play Cozy Grove: Camp Spirit without having played the first Cozy Grove before?

Yes, you can play Cozy Grove: Camp Spirit even if you have never heard or played the original game. While the games exist in the same universe, both stories are completely separate and you can play them in whatever order you want, or even at the same time.

If you want to dive into the first Cozy Grove, these articles can help you out.