KK,
Though I have only fished for crappies a few times in my life and not for a long time, I believe the specialized poles are for the softer mouths crappie have. This differs from the spinning rods I have for my kids as though they are fairly light, the have enough stiffness/backbone to set a hook in the trout or salmon that we often target. Often with lighter spinning rods, particularly with coho and bulltrout on spoons, my 7 year old daughter often reels a fish in only to have it simply open its mouth and the spoon falls out. Because of this, I think a little bit of stiffness is good for kids to set the hook on the bite. That being said, the rods you have are probably fine for crappie. I imagine an awful lot of crappies have been caught on a regular spinning rod