My name is Lilith, I'm on the Social Care team at Shopify.
At this time the Shopify Fulfillment Network doesn't handle perishable items. This includes refrigerated items or frozen foods.
For a bit more information on the current businesses that could benefit from the network, as well as more information on the features of our fulfillment services you can check out our Shopify Fulfillment Network page.
Have you looked into other 3rd party fulfillment or logistics companies (3PLs) to help handle your frozen food orders?
We have a couple of excellent guides to help you find one that will fit your unique needs:
Let me know how you do with the information above! I'm happy to answer any questions you think of as you work on your business.