Sure. Most actor releases encompass everything including likeness, image, silhouette, movements, performance, creative input, etc, etc. All you really are using is their voice, likeness, and performance, but it can't "hurt" if it's a regular actor's release form. I like to add "creative input". Sometimes people improvise. Probably frivolous for someone to argue that they added the script and that they want more compensation but it can't hurt to add more language.