There are two products that I have fond memories about from my youth. Neither product was particularly popular that I recall, but they were at our house.
The first product was from Libby's and it was called "Fruit Float". It was a gelatinous, fruity mixture that you mixed with milk for a creamy fruity dessert. Yum! I remember pineapple and strawberry flavor and there might have been a mandarin orange version also.
The other product that comes to immediate mind is "Souper Sandwich". It was a frozen sandwich with a frozen bowl of soup. i remember the tomato soup and grilled cheese (of course) and some other sandwich with chicken noodle. This was a Campbell's product that I remember, but it did not last long.