If a player has a collision with the static image, then a collision happens 1 time. But if the image is animated, the repeated collision, even if the player does not move.
void OnTriggerEnter2D(Collider2D other) {
if(other.gameObject.tag == "nanim") {
//Happens once
print(other.gameObject.tag);
}
if(other.gameObject.tag == "anim") {
//Happens many times
print(other.gameObject.tag);
}
}