Finding Gameobjects with tag and then deactivate it child

Hi I have on my scene 3 gameobjects with tag "Wrog" and thej all have 1 child element "zaznaczenie".

I want to create function with will find all gameobjects with tag Wrog and then set active=false on child element zaznaczenie. How can I accomplish this? Im trying with this, but no luck:

 function odznacz_wszystkich()
 {
     //narazie to nic nie robi
     for(var fooObj : GameObject in GameObject.FindGameObjectsWithTag("Wrog"))
     {
             //Debug.Log("Znaleziony:" + fooObj.name);
             var zaz:Transform=fooObj.transform;
             
             var zaz2:Transform=fooObj.transform.FindChild("zaznaczanie");
             //Debug.Log("Znaleziony:" + zaz.name);
         zaz2.active=false;
     }
 }