You can cook the Turbot from frozen, just pre-heat the oven for 12 to 18 mins. Brush the fish portions with preferred oil and put them in the baking pan, skin facing upwards. Mid-height inside the oven and bake for 15 to 18 minutes.
You can pan fry the frozen turbot as well. Cook with a bit of oil in a hot frying pan to set the skin. Turn them halfway and continue cooking for around 6 to 9 minutes on the other side.