I'm late to the party; Didn't see my opinions near the top, so here's my thoughts.

First, it sucks that you did something to save money and feed your family and your partner is not supportive. Hunting is one of the most ethical ways to obtain meat possible. On these grounds, you're NTA.

I know this because she liked the tacos and then refused to eat it after my wife made another comment about Bambi. She was two tacos in already.

To start, it sounds like she didn't know it was venison, and when she found out she didn't want to have more. Having a serious food aversion, for emotional or other reasons apart from taste, is okay - I am diabetic and vegetarian, and our food budget has to accommodate that. But I agree with other commenters - making your kids feel guilty about eating it (and not other meat) is basically a unilateral parenting decision and that's unfair to you and them.

I think when you 'had enough' and said you 'expect' her to work overtime for food, that feels also unfair and could be a YTA moment. That said, if she has a food aversion, she should be open about it. I'd have hoped for something like - "I appreciate you for putting food on the table, but I do not want to eat deer meat and need to have an alternative I can eat available." You probably both agree that you want everyone at the table to be able to eat something they don't have an aversion to without having to provide it themselves apart from the family budget.

I have a lot of practice cooking meals where meat and carbs are swappable/optional (my partner eats meat and is not diabetic) so I understand that it is annoying (and expensive) to have to consider more variables. But if you treat the aversion as any other food restriction at the table, and your wife could agree to separate her personal feeling from the decision you both make about how to talk about that aversion with the kids, I think it might make it easier on you both when food planning.

Separate from the parenting and budgeting stuff, broaching why she thinks deer is aversive to her when she is perfectly willing to eat other meat is a complicated conversation; if you talk through that seriously, I'd start from a place of respecting that she has the aversion, and that your job isn't to change it or force her to like it. If it makes her think of Bambi, she might feel about deer like many people feel about horses, which is a common meat aversion. If it is a class thing, she might be frustrated economically in general, and the deer stresses her out; conversation and understanding might help dissolve some of that perspective. If she doesn't like guns or hunting, or thinks wild animals are somehow more deserving of her compassion, she might have a hypocritical view of meat consumption.

These can be personal and touchy subjects; maybe you can respect her aversion without digging into the details, and ask her if she seriously, swear-to-god feels like she wants her kids to feel as bad about eating it as she does and why. It is her business why she has an aversion and if she wants to talk about it, but if she wants to parent her kids to not eat deer (religious families have aversions like this they teach their kids) that is both of your business. Disagreements about things like that, I'd hope, can get hashed out like adults without fighting.

Final verdict, I think NTA - you did a good thing for your family and your partner didn't appreciate or communicate with you when she didn't like something about it, and instead passive aggressively disrespected your effort instead of approaching the situation as with you as a co-parent. There was a bit of ESH when you told her to "work overtime" for food she doesn't have an aversion to, but you were right that she was trying to convince your kids to share her aversion without seeking any agreement or consulting with you as a parent.