Sort of a grand understatement - that is, in terms of temperature.
On a free floating planet in deep space far from a sun the temperature would be about -459° Fahrenheit, -273° Celsius, or 0° on the Kelvin scale.
The temperature in deep space is thought to be 0° Kelvin, for the most part. So any such planet in deep space would be more than just frozen...
Frozen - a fun word to use to pull kids into a science discussion...