Why’s it called a refrigerator? Can’t you use it for cooling something for the first time?
The answer comes in Latin!
Artificial refrigeration was first demonstrated by William Cullen in 1748, and the earliest refrigeration machines developed in the first half of the 19th century. But the word refrigerator is much older; it dates to the early 1600s, and refrigerate, from the Latin verb refrigerare and ultimately from the adjective frigus, meaning "cold," dates to the preceding century. Frigus also gave us our adjective frigid.
(It should be noted that, as is consistent with Latin words, frigus and refrigerare were each pronounced with a hard g--that is, like the g in good. The shift to a soft-g sound—that is, pronounced like the g in gesture--in frigid and refrigerate didn't occur until both words were established in English and at the mercy of French pronunciation influences.)"
For more fascinating and cool information, you can look here:
Merriam Webster - Etymology for Refrigerator
Why use the d in the shortened version ("fridge")? is another valid question, but if you consider the word without it, the answer will occur to you. : )