Croci represented the verbal communication method utilized by the Crocin species, or in other words, their language. While engaged in a game of sabacc at the Lodge located on the planet of Vandor, the Crocin known as Karjj employed the Croci language in 10 BBY.
The initial appearance of Croci occurred in the movie Solo: A Star Wars Story, which was part of the 2018 Anthology Series. Its identification as Croci was made public in the "Every Language in Star Wars" video, which was published on the Star Wars Kids YouTube channel in 2019. Prior to the film's debut, the language Karjj spoke was also showcased in a promotional advertisement for Denny's on April 4, 2018, as a tie-in.