I don't think I've ever seen a refrigerator that doesn't have some kind of temperature control. The control knob might not be very self explanatory in terms of which way to turn the dial to get a higher or lower temperature setting, but there's usually some kind of dial.

We have one under-counter refrigerator where the knob is under the front panel and you have to get down on your hands and knees to even see it. The others all have something inside the refrigerator, usually at the top back.