Man pages matching name fsck.exfat in section 8:

fsck.exfat.8.en	debian 10 / exfat-utils
fsck.exfat.8.en	debian 11 / exfat-utils
fsck.exfat.8.en	debian 11 / exfatprogs
fsck.exfat.8.en	debian 12 / exfatprogs