I wanna know. Eggnog, which is only good for adding liquor, is fucking disgusting. I will engage in good faith arguments for why there is eggnog ice cream, but there is a reason this was in the discount end cap section, so you got an uphill battle already.
Clearly you haven't tried this shit. The yellow one that says "rompope" is essentially eggnog.
I'm vegan now but the almond eggnog is pretty good too. It's less "dense" and creamy and has a good almond flavor as well. It isn't as good mixed with liquor though.