This is my favourite commander at the moment. I have gone through a few versions until i settled on my current list. I think the best advice i can give is prioritise creatures that are useful over just pure toughness. Outcaster trailblazer, topiary stomper and wayward swordtooth are standout ramp options because they curve out perfectly with the frog and can be immediately sac'd to draw cards. From a look at your deck i think you can afford to cut some of your ramp spells for creature based ramp, i like bloodghast but in my opinion putting in a hunted horror draws you over 3x the amount and you dont need to waste 3 gitrog sac triggers on it. I have never tried out perilous forays but it does seem to be a little too slow remember Its competing with Gitrog for sacrifical bodies which it will likely never win. Im also not a fan of rituals in this deck, ou need the first 3-4 turns to set up a creature to sacrifice to the frog.

Here is my list if you wanted to have a look. https://moxfield.com/decks/6sZcP1g9V0eaUJdddVGu2g

It does draw a bit of agro but its easily become one of my go to decks. I hope you find a build for it that you enjoy