For the most part, no. Thieves’ Cant is a specialized type of coded language only understood by Rogues. Since it is somewhat coded, cryptic, and uses specialized words it is taken to be encoded and therefore gibberish to someone using Comprehend Languages. I kind of see it as a form of public cipher cryptography when all of the information is right in front of you but you need a key to understand what words are important. That is unless the DM disagrees and rules that it is a form of language and can be comprehended; again all up to the DM.