Campestris were a species of sentient fungal-creatures related to myconids.
These creatures bore some resemblance to myconids, but compared to them had a far stronger resemblance to mushrooms and lacked arms. Their bodies varied in color from dark brown to tan to white. Their caps were always purple or red with speckles.
Campestris had a degree of semi-intelligence, shared collectively among each herd. They were very carefree, had a rudimentary sense of reason, and a warped sense of humor. They were captivated by any sort of singing or playing of an instrument, no matter how terrible it was, and would happily sing along as they danced around the individual.
Campestris were capable of locomotion by expanding and contracting their "root-balls." Once per day they could release a cloud of spores within a 10 feet (3 meters) radius that had an effect similar to the spell slow.
It was very difficult to surprise these creatures, as they were very sensitive to sounds and vibrations. They could also easily imitate both music and words.
Source: https://forgottenrealms.fandom.com/wiki/Campestri