I don't think they provide one. If you have frozen food that you want kept frozen, you'll need to protect it yourself. Your belongings might be on the transfer truck for a while.
Hum, didn't think of this issue for our December trip. So I'd have to buy just enough perishable groceries that'll last for the 1st part of the trip; then get a second batch? Maybe I should aim for just one resort after all.