You probably need a zoology/wild life degree before you can specialize that much. Some universities may have a herpetologist researcher or two and if you’re part of a special program (honors, undergraduate research..) you may be able to assist them - basically, going from grunt work/wash beakers to observing to research, if you’re good.
You may want to combine it with a minor or concentration in Environmental science or bio/statistics.
Contact people who work at your local zoos or zoos that you have been to more than once and ask what they studied, where, and what studies they’d recommend.
Good luck!