Yes, we can. You can host static content in GCS in the same way that you would using S3, or you can Google Cloud Load Balancer to do more complex setups, such as mixing static GCS content and compute URLs on the same domain.
If you're interested:
https://cloud.google.com/solutions/web-serving-overview#host...
https://cloud.google.com/compute/docs/load-balancing/http/us...
Disclaimer: I work on Google Cloud Storage.