Untitled

private void OnTriggerEnter(Collider char)
{
    var en = char.gameObject;
    var head = en.transform.Find("Head");
}

private void OnTriggerEnter(Collider collider)
{
   //Where Head is an empty script attached to the Head.
   var head = collider.GetComponentInChildren<Head>();
   //Do something... Logging the name for example
   Debug.log(head.transfrom.name);
}

public static Transform FindDeepChild(Transform aParent, string aName)
    {
        Queue<Transform> queue = new Queue<Transform>();
        queue.Enqueue(aParent);
        while (queue.Count > 0)
        {
            var c = queue.Dequeue();
            if (c.name == aName) return c;
            foreach (Transform t in c) queue.Enqueue(t);
        }
        return null;
    }