Yes, I'd love to do more research for you.
http://ucce.ucdavis.edu/files/datastore/234-779.pdf - This may be about fruits and vegetables, but freezing doesn't cause a great deal of nutrient loss in the short term (and some of that is due to the blanching before hand with vegetables) but does have some decent loss long-term (They mention 1 year and older at one point).
Seems to be lots of scientific plant articles, but not much on meat so far-
https://pdfs.semanticscholar.org/fd9...852b9add90.pdf
Nutrient loss depends on type of vegetable, particular nutrient (carotenoids, vit c, phenols, thiamin, etc), cultivar of the species of fruit or veggie (can be very large differences) Please pay close attention to the length of storage as detailed starting page 18, where significant loss in some veggies is seen at time spans of 1 to 2 1/2 years.
My snakes have been fed f/t from the get go. I did notice some changes when I had purchased too many feeders and had some in the freezer for up to 12 months. I now space my purchases to use up most of my stock by 3 or 4 months.