Do Holly Ferns like their leaves (fronds) getting wet when watered?
Holly Fern Leaves
Certified GKH Gardening Expert
It isn't normally a problem to do so. If the area remains too humid, then this could cause a mold issue. But in most circumstances it will be fine to get them wet.
Here is an article for information on the care of these: https://www.gardeningknowhow.com/ornamental/foliage/holly-fern/growing-holly-fern-plants.htm