Kazuul, Tyrant of the Cliffs

You're the defending player if a creature is attacking you, a planeswalker you control, or a battle you protect.

The ability triggers and resolves during the declare attackers step. If you put an Ogre token onto the battlefield as a result, you may block with it during that combat phase.

If an attacking creature has a "Whenever this creature attacks" ability, that ability is put on the stack first, then Kazuul's ability is put on the stack. Although Kazuul's ability will resolve first, and potentially create an Ogre token, any target of the other ability will already have been chosen at this point, and thus could not have been the new Ogre token.