Animate Blender model with primitive colliders

Quick question

I have a simple snowman made in blender in unity with primitive sphere colliders in each of the snow balls. The animation in blender basically makes the snowman shrink down flat against the ground. I animated this using an armature and bones.

As of now, I have a sphere collider attached to each snowball along with a script that onCollisionEnter calls the snowman animation. I would like to make a boolean within the snowman script that allows the animation to only be played once. Since the script is attached to 4 different bones, would I need to create another script that would communicate with all four of these scripts? Or is there an easier way.

I am unfamiliar with animators which is what I am going to look into but if there is any easier way, please let me know.