OgreNPC is alive but it does warn none.. What am I doing wrong?

First of all, you might wanna use elseif and else in the end, since that your current "else" only outputs if it's not a "RatdogNPC"

Here,

if workspace.DungeonTemp:FindFirstChild("Wave1") then 
local tableOfEnemies = game.Workspace.DungeonTemp.Wave1:GetChildren()
for _, enemy in pairs(tableOfEnemies) do
	print("Wave 1")
        if enemy == OgreNPC then -- if OgreNPC
            enemy.ClubHitbox:Destroy()

        elseif enemy == RatdogNPC then --if not OgreNPC but is RatDogNPC
            enemy.HeadHitbox:Destroy()        
        else
            warn("None of these enemies") -- if it's none of them
        end

end

Plus, not sure, but you might wanna check the "Name" property of the enemy(?), and quote the NPC's name

enemy.Name == "RatdogNPC"