It's common for people to mistake cornichons and gherkins as interchangeable terms because of their similar appearance, but we'll set the record straight. Cornichons are a bit smaller in size than gherkins and may also be referred to as "French gherkins." Like other pickles, they can be fermented or marinated in a mixture of herbs like dill, tarragon, or pepper.

Read More: https://www.tastingtable.com/831648/different-types-of-pickles-and-what-makes-them-unique/