A few, but they all explicitly require DM's permission - > As it is a method of communication, can it be taken as a language? Not as a part of standart character generation. You will require an [explicit DM's permission][5]: > *With your DM's permission, you can instead choose a language from the Exotic Languages table or a secret language, such as thieves’ cant or the tongue of druids.* Thieves' Cant is meant to be granted by a [unique][1] class feature. Even spells like [Comprehend Languages][2] do not allow you to [understand Thieves' Cant][3]. > Are there any other rule mechanics e.g. background, that could grant Thieves' Cant? There are no "official" ways to get this feature other than taking a level in Rogue. However, with the DM's approval, you can get it from a custom background, homebrewed class archetype, or learn as a language. Lore-wise, Thieves' Cant is [anti-language or secret language][4] is the jargon or language of a group, often employed to exclude or mislead people outside the group. It is a skill to hide secret messages in whatever language you are currently speaking. Rules as written, a DM can allow Thieves' Cant as a custom *background feature*. See the PHB page 125 "Customizing a background": > *If you can't find a feature that matches your desired background, work with your DM to create one* You can also **learn Thieves' Cant** during your downtime, if there's someone who agrees to teach you: > You can spend time between adventures learning a new language or training with a set of tools. Your DM might allow additional training options. > First, you must find an instructor willing to teach you. The DM determines how long it takes, and whether one or more ability checks are required. [1]: https://rpg.stackexchange.com/questions/53898/ [2]: https://www.dndbeyond.com/spells/comprehend-languages [3]: https://rpg.stackexchange.com/questions/115608/ [4]: https://en.wikipedia.org/wiki/Cant_(language) [5]: https://www.dndbeyond.com/sources/basic-rules/personality-and-background#Languages