Alex, maybe you could direct us to exactly where you got your information? You know, to clarify what has been said. And what meat "specialist" are you refering to because I'm sure a lot of us here would love to have a conversation with him/her on the subject. Especially since 99% of all meats consumed by people is frozen.
Sry, I forgot to answer the question
I wouldn't recommend the canned foods so much for insect eaters like geckos and such (they like to hunt thier food), but they are a good addition to the diet of many box turtles and tortoises, beardeds often accept them and perhaps a few other species. The biggest challenge is to get your reptiles to try them!