Syncing Model Animation With Face Changes

Hello.

I have imported an animated model, it has an attack animation, what I want to do is change the eye texture of the model into the "angry eye" for specific range of frames during the animation, for example, if the attack animation is 50 frames in length, I want a way to make the eye change into the angry expression during frames 12 to 36 only.

What I need to do is catch the event of entering frame 12 during the animation, then I can change the offset of the Main Map in the material of the eye (I have all eyes expressions in one texture)

Is there a way to achieve this?