Sacchaka, usually spelled Saccaka, is not a standard Jain canonical figure in the Jain āgamas. In Jain comparative literature, he is mentioned mainly as a person known from Buddhist texts, and some Jain works note that he was said to have debated with Mahāvīra / Nigaṇṭha Nātaputta. ( jainqq.org)

So, the short answer is: he is mentioned in Jain scholarship and comparative discussions, but not as an established Jain text character in the way Mahāvīra, Gautama, or Śreṇika are. ( jainqq.org)