So I was thinking about buying a bait caster and throwing some 50lbs braid on it and using it to fish with frogs. What bait caster would be best for this?

Brand, make, and model don't necessarily matter.  Most people will tell you the only thing that matters is aluminum frame, quality drag system, and a 7.0:1 gear ratio or higher.

Look at a Diawa Tatula Type R . The reel is super smooth and is available in a 8-1 ratio.  They can be purchased on Amazon for about $140 they retail around $200

Drag has to be over 10lbs

Metal frame and beefy gears would be nice

Fastest gear ratio possible

Good casting weight window for a half ounce frog

 

Oh, and a huge difference maker for me that people don't spend enough time dialing is braid test and type.  I use 40# Smackdown now and it was literally out casting 30# 832 by a significant margin and it's the smoothest and quietest I've found.  I've also gone up to 55# FX2 and it was just overkill and super loud...  Unnecessary.  My butter zone is #40# Smackdown for life, it's crazy line.  Do yourself a favor and don't just assume you should have 50lb on there though...  You could be losing a lot of casting distance you don't need to. 

 

Fast with a good drag is main things I'm interested in. Currently using a BPS Titanium 8 in the 8.1 ratio and like it really well so far. 

12 hours ago, lecisnith said:

Brand, make, and model don't necessarily matter.  Most people will tell you the only thing that matters is aluminum frame, quality drag system, and a 7.0:1 gear ratio or higher.

^^^ This pretty much sums it up. ^^^ Several reels from different companies will fit the bill here. If you have a reel family that you are familiar with already, get one with the specs listed above and you will be good to go. Good luck!! 

Go with a Curado 200I in the 7.2:1 gear ratio. A MH graphite rod and a minimum of 50 pound braid are what you should use. When lost of bass over 5 pounds exist or you are fishing very thick cover, go with 65 pound braid or higher. I prefer a MH rod for frogs because a H action with braid seems to rip them away from the fish on a strike easier.