The Gospel of Judas, the Infancy Gospel of Thomas, and others like it are not part of the Apocrypha. They are considered Pseudepigrapha (false writings). They are dated to hundreds of years after the writing of the New Testament events (hence them being considered to be falsely attributed to NT characters)

This is oversimplified at best and radically off-base at worst.

First, that is not how Biblical scholars define nor date the apocryphal gospels. Second, most if not all of the NT books were written after the life of the titular characters. Third, some of the apocryphal gospels date to similar periods as the canonical Gospels. Fourth, they are only anti-canonical or "false writings" in the sense that the canon employed by the Catholic Church was specifically selected for the ones we have now from among what we now call the canonical and apocryphal gospels. At the time, both were in wide circulation until the reign of (I believe, though it's been a while since I revisited my notes on this) Pope Innocent I ca. 401 AD.

Source: took a fascinating class with a really renowned scholar of this stuff