am i overstocked in mu 29 gallon?

Overstocked as well as mistocked, some of those fish are not in a proper school or group.

Yes, but just barely.You have a lot of really small fish that aren't territorial, but you're overstocked on catfish. I wouldn't add any more fish and make sure you have a filter rated twice the tank capacity.With an AquaClear 70, the tank should have a strong cycle. Watch the Pleco, i'm not sure what type you have but common ones get a foot long eventually.

Panda corys are the most difficult Corydoras to keep and they need non-fluctuating water chemistry and pH. They are known to die of stress if tanks get even slightly dirty. If you don't have a BIG power filter, I suggest you get one. I use Aquaclear 70's on both my 29 gallon tanks.

Yes...

I have 3 guppies, 3 Green cory cats,10 White Cloud minnows and 2 Dwarf frogs and I feel like thats getting close to pushing it.

Find out the expected full grown size of your fish every inch of fish should have 1 gallon!