The spore-bearing leaves of ferns are called
Sporophylls
Ferns are pteridophytes, i.e. they are land plants which reproduce through spores. These spores are formed in structures called sporangia. The leaves which bear these sporangia are called sporophylls. sori is a cluster of sporangia. The leaf or leaf-like part of a palm, fern, or similar plant is called frond. Hence the answer is sporophyll.