First, I can say your Tigrerra is not fake because my Pyrus Blade Tigrerra also same as yours. FLAT-HEAD screws/pins in their feet joints.About the Griffon, see others if they can help you.
A bunch of my before NV bakugan had them.Haos tentaclear,Pyrus Fourtress are the only ones I can remember though
Well I stopped collecting (temporarily) during Series 2. I only have one Bakupearl because someone gave it to me so I wouldn't really know about the other series between Bakupearl and Bakuneon.