Collision 2d Issues with Sprite

http://i.imgur.com/mq4N0Gm.png http://i.imgur.com/w8MedV7.png

This sprite is supposed to act as my foreground(where the player walks on ) when the foreground tag is given to it upon collision with the player. It fails to flag it the onfloor bool. The script is attached to the bottom square of the player which acts as the collider.

 void OnCollisionEnter2D (Collision2D col)
 {
     if (col.gameObject.tag == "Foreground" || col.gameObject.tag == "Untagged") 
     {
         Player.onfloor = true;
     }
     
     
 }