I buy "frog" rods with the purpose of frog fishing first, but being versatile enough to do other stuff with if the frog bite is not "on", or for really early/late in the year cold water stuff. But from late April-late October there is always AT LEAST one frog tied on and on deck ready to go.
Before I give my thoughts on rods, I'll go with reels and line first, as its much simpler.
Line: 50lb braid....done. Pick your favorite brand. I am not a fan of using anything less than 50, or more than 50. 50 is the sweet spot. Strong enough to winch big fish out of the heaviest of cover, nimble enough for skipping and walking.
Reels: METAL FRAME ONLY....don't go cheap ( I didn't say inexpensive). The frog it self is not a high resistance bait that will strain a cheaply made reel, it's the abuse you will put it through over the course of it's life if your regularly catching quality fish on frogs....which often come with 3x times the weight of the fish in attached salad. You need a reel that will hold up to that. Drag power is of no concern...lock it down and be done with it. Gear ratio....faster is better. You can get by with a 6.something :1, a 7.something: 1 is better, anything 8+ is ideal. IMHO Daiwa Fuego CT's in the 8.1:1 that can be had new for less than $70 are a tremendous bang for the buck right now. I am starting to lose track of how many I have LOL.
Rods: There is a lot of personal preference in selecting the right frog rod. Some want broom stick power, other's want light weight for all day comfort, some want a more delayed/moderate action to solve what IMHO is operator error in pulling baits away from fish (I'm good at NOT doing this,but I'm not perfect), and others yet want a blended combo of all three. I'll throw in extreme durability as well, big hooks sets with strong line in nasty cover will expose a rods weakness really quick
Here are rods that I have owned that were bought with purpose of being my frog rods that I HATED:
St Croix Mojo Bass (SCII, Gen 1) 7' H/F "slop and frog". This fit the broom stick power, and durability requirements...but was a heavy, unbalanced pig. It was not fun to fish with all day and was a very poor choice for target casting frogs into tight spots.
Kistler Magnisum Jig and Toad 7' H/F....light, nimble, powerful enough. Terrible durability
Falcon Bucoo Micro 6'10" H/F.....really really light, nimble, good durability, excellent accuracy, not good in the power dept. Plus micro guides clog up with every little bit of gunk and make for some interesting issues that you don't have with "normal" rod guides....especially during cotton wood season.
St Croix Rage 7' MH/F....boy this is a good "what might have been rod". Light, powerful, durable....I actually really liked the handle, and reel seat....but those dang micro guides. If this rod had regular guides, it might still be my frog rod.
Any thing from Abu Garcia...and there's been too many to remember.
Here are rods that surprised me at how good at frogging they were:
Berkley Lightning Rod Shock 7' MH....despite it's low price tag, it was my "go-to" frog rod for many years, and that's AFTER using some of the more higher priced rods mentioned above. Light?...not so much. Durable?....extremely. Accurate?....it was decent, the low number of guides kind of hurt it a little in this dept. Powerfull?....just good enough, it always handled big fish in heavy cover for me, but it also always felt like I was on the edge of disaster, yet it never let me down.
St Croix Mojo Bass (SCII, Gen1) 7' MH/F. This did everything well, and was a much better choice than the actual "frog" rod in the early Mojo line.
St Croix Avid 7' MH/F.....same as the above Mojo, slightly lighter.
Daiwa Aird X 7' H.....pretty much the same as the Lightning Rod Shock, a tad lighter, and better guides.
Now for my current frog rod:
Dobyns Fury 735C 7'3" Mag H. It's light, the best balanced rod I have ever owned, and fits all my power/accuracy/comfort requirements. Durability will be hashed out over the course of the next season...I have only had these rods for a few months now, but so far so good. I always liked 7' rods for frogging because MOST longer rods seemed awkward, cumbersome, and inaccurate in tight spots in my hands. Not so with this rod. I don't know what Dobyns did to make this rod fish so well, but it does. And it does more than frog well, I use for a TON of stuff, and it is truly a general purpose workhorse that isn't just "good enough" for stuff. It actually surprised me how many things it seems to be a perfect fit for. I generally DON'T buy multiples of many rods, but I did with this. That's how much I liked it.