I don't see why not, yeah. As long as the attack takes place during the opponent's turn, and the requirement for the reaction is met.
So if the Wild attack is your own beast attacking you, then you cannot react to it because it is happening during your own turn.
If you defeat Anum with a normal activation, and his Frenzy ability makes one of his beasts attack you, then you also could not react to that, because it is happening during your own turn.
But if the Wild attack or Frenzy/Incite attack takes place during your opponent's turn, then you can react to it. This will normally be the case if Anum or the Incite tactic is activated during their turn, or if it is an enemy beast making the Wild attack.
Amusingly, if Anum attacks you, and you react with a counterattack, and the counterattack defeats Anum, and Anum makes one of his beasts Frenzy and attack one of your other models, then that model could react, since then Anums death would happen on Anums own turn.
(Edit: This does not work because you can only do one reaction per turn, see below.)