Went out and scuba dove a local Lake and saw countless Bluegill around the 2-3" length and several large schools of baby bass around 3-4" mark. Lake has lots of grass. What would yall throw to imitate these baitfish?

Couldn't hurt

There are, of course, lots of good crankbaits in bluegill and baby bass variations. That being said, those type of baits may or may not be productive for your local lake.

Depends on the clarity of the water and depth.... swim jig, swimbaits, and oh yeah...crankbaits

I catch most of my fish 10-20ft. There is a strong thermocline around 15-20ft. Clarity was 5ft and usually is 10+. Grass is so abundant I feel like it's more of a pain than it is good cover to fish. I was looking at swim jigs and swimbaits. What size yall usually throw at the 15-20 ft range? I'm thinking a trig would be the best bet for bottom presentation since it's is the most weedless