Zoo internships are hard to come by and jobs even harder. While it doesn’t offer herpetology specifically, Otterbein is one of only a few schools I know of that have a zoo program. If you specifically want a zoo program, I think Otterbein is the top choice for this major due to its connections to the Columbus Zoo.
You may want to look into the Wildlife Conservation Biology or Fish and Wildlife major. This major is available at lots of schools and will leave you with much broader job possibilities. You can look within programs to see how many herpetology courses they offer, or search for who is doing herpetology research and where they are located.
Zoology is more about the study of classification and systems of animals, where Wildlife Biology will be more hands on and study populations, how animals interact with the environment, conservation and behavior. Would you rather spend more time in the lab or in the field? Zoology is very lab heavy while Wildlife Bio is more field heavy.