National Frozen Food Day
Yes, there is such a thing, & you'll not be surprised it originated in the USA.
Frozen food is not usually highly regarded, as regular freezing results in flavour loss, but a technique known as "flash freezing" means the product retains all it's flavour.
https://en.wikipedia.org/wiki/Flash_freezingAnd taking "believe it or not" one step further, who invented "flash-freezing? None other than Clarence Birdseye.
https://en.wikipedia.org/wiki/Clarence_BirdseyeAnd yes, his name lives on, the business he founded, & sold for $22 million back in 1929, still exists as Birds Eye Frozen Foods.