Well yes, but they are not the optimal choice. You could use plain old automotive starter batteries if you really had nothing else, but they're an even poorer choice.
Marine starting batteries are a compromise; Their plates are thicker than a starting battery, but thinner than a true deep-cycle battery. They are better than nothing, but they will NOT last a long as a real deep cycle battery.
Don't buy them just because your local store has them in stock. Spend a bit more effort to find someone marketing real off-grid batteries in your area.
To answer the refrigerator question, assuming a frig uses ~1200WH per day, and you don't want to use more than 20% of your battery capacity, you need (1200W/system voltage) x 5 = battery size. Let's assume you design a 24V system. Your battery size should be (1200/24) X 5 =250AH. Four 6V golf-cart batteries would supply about that much capacity. Plug in whatever alternative numbers if you chose to make design changes.
To expand on this a bit more, to keep these batteries charged, you'll want to charge at about 1/10C, or 25A. To get 25A at a charging voltage of about 26V use 25A X 26V X 1.25FF = 812W. Three 260 to 275W grid-tie panels wired in series would produce this much power.