No, ferns are not fungi. Ferns belong to the plant kingdom, specifically to the group known as Pteridophyta, whereas fungi belong to their own kingdom called Fungi.
Ferns are vascular plants that reproduce via spores and have a complex life cycle including both a sporophyte (the leafy plant we see) and a gametophyte stage. They have chlorophyll, which allows them to photosynthesize and produce their own food, similar to other plants.
On the other hand, fungi are heterotrophic organisms that absorb nutrients from their environment. They do not contain chlorophyll and do not perform photosynthesis. Instead, fungi break down organic material in their surroundings and can often be found decomposing dead matter, forming symbiotic relationships, or even living as pathogens.
In summary, although ferns and fungi may share some superficial similarities, they are fundamentally different in their biology, classification, and life processes.