Can I use a face ice roller on sore muscles too?

You can, but it's not ideal. Facial ice rollers are designed for delicate skin and shorter sessions. For muscle recovery, plantar fasciitis or deep-tissue work, reviewers consistently point to dedicated cold massage balls (like the Recoup-style Cryosphere or Phyya Rehab) that are heavier, freeze for longer cold-retention windows, and are built to take pressure.