Preheat the oven to 350 F and line a large baking sheet with lightly greased parchment paper.
Drain the cans of tuna and squeeze out the excess liquid. Add the tuna to a bowl and flake with a fork.
Add the sweet potato, eggs, coconut flour, arrowroot, and seasonings. Mix with a rubber spatula until fully combined.
Form the mixture into uniform tuna cakes (you should have about 8) and evenly space on the baking sheet.
Bake in the oven for 20-25 minutes (or until crispy), carefully flipping about halfway through. Note that the tuna cakes will be more delicate if using an egg substitute.
Remove from the oven and serve with a dip of your choice (like an aioli or avocado mash) with lemon wedges.