Are you fishing from a boat or from the bank?
I wouldnt go any smaller then a 7ft, and since its thick vegitation, I would go with a Heavy with a fast tip. If the grass was less dense, then I would suggest a MH so you can “walk” your frog.
If you’re fishing from the bank I’d go with a longer rod for better leverage. 7’3-7’6H range
I always fish a frog on a 7.x:1 reel.
I use 50lb braid up to 65lb. From the bank, Id go either 65 or 80 (again…..more power to horse one out since you cant go to it)
My set-up is a 7MH Tour ROJAS frog rod with a KVD Tour 7.3:1 reel and 50lb braid.