Cryptozoology is the study of cryptids. It is the attempt to study mythical creatures in a scientific fashion. Cryptozoologists are those that study cryptids and cryptozoology. Cryptozoology is not recognized as a branch of science by mainstream scientists.
Just as cryptozoology, a branch of zoology, is the study of animals whose existence has not been proven, cryptobotany, a branch of botany, is the study of plants whose existence is not recognized by the scientific community.