NO! You should only ever steam fish if it is fresh. Not even if it has been thawed. Frozen fish has a distinct 'fishy' smell to it and thus not suitable to be steamed. Steaming helps retain and brings out the integrity of the fish (or whatever you're cooking) and thus you want to use fresh. If you've got frozen fish at home, opt for a more flavour enhancing cooking method such as pan-frying or searing. Get it nice and golden and add some garlic. This will help overcome the 'fishy' smell or fishy taste.