Preheat your grill slowly, adjusting the flames to be between medium-low and medium. Allow to preheat to 425 degrees. (Alternatively, preheat your oven.)
While grill preheats, line a baking sheet (that you’re certain will fit in the grill) with foil and spray with baking spray. Spread the frozen tater tots into an even layer.
When grill or oven is preheated, add the pan of tater tots and bake. The tater tots will bake for approximately 20 - 25 minutes, total.
Meanwhile, set a cast iron pan over medium-high heat. Add 1 pound ground venison and cook, breaking the meat up into small bits, until nearly browned, about five minutes. When meat is almost browned, add 1 packet of taco seasoning, 14 ounces diced tomatoes with green chilies, ¾ cup water, and a few shakes of hot sauce, if desired. Cook, stirring occasionally, until sauce has reduced and is thick enough to coat the meat, about 10 minutes.
While the sauce thickens, give the tater tots a gentle shake and rotate the pan to ensure they’re baking evenly.
Once the meat is finished and the tots are golden brown, reduce the grill/oven heat to low. Sprinkle half of the shredded cheddar and pepper jack cheese on top of the tater tots, followed by the prepared venison, ½ cup diced red onion, and ½ cup diced orange bell pepper. Top with the remaining cheese.
Bake nachos until cheese is fully melted, about 5 minutes.
Immediately top melty nachos with diced tomatoes, sliced jalapeños, sliced avocado, a drizzle of sour cream, a sprinkle of cilantro, and a squeeze of lime to serve.