If you can't find an LED bulb marketed specifically for refrigerators, look for one that is specifically marked as suitable for damp locations, because many of the standard LED bulbs I've seen specifically say "not suitable for damp locations" directly on the bulb.
NOTE: Some LED replacement light bulbs are not recommended for wet/damp environments. Refrigerator fresh food and freezer compartments are considered wet/ damp environments.
Note that not all bulbs are created equally. I bought a 2-pack of Philips LED bulbs that were marked as being "suitable for damp locations" directly on the bulb and both burned out within a few months. However, I replaced those with a different brand of LED bulb that has been working fine for over 6 months now. That bulb wasn't marketed specifically for refrigerators but it did say "suitable for damp locations."
As manassehkatz-Moving 2 Codidact mentioned I would also try to match the wattage equivalency of the existing bulb. 40W seems pretty common although my refrigerator actually seems to use a 60W bulb; I tried a 40W-equivalent bulb and it wasn't bright enough.