Depending on the brand and ingredients, I think there's a difference between prepared frozen food and ultraprocessed food. When I hear ultraprocessed I think pink-slime hotdogs, spam, sugary hamburger buns, etc.

In terms of health, I don't know that there's much of a difference between a frozen burrito and one made at home, provided the meat isn't abnormal.

Edit: I got curious. Here's the Ultraprocessed Foods Quiz from the archive.