No, there is no OnePlus Nord 2 yet, but it looks like that announcement might happen soon. OnePlus accidentally mentioned the Nord 2 in an FAQ for the company's new partnership with the Google Stadia gaming service. The company is running a new promo where newly purchased OnePlus devices come with a Stadia Premiere Edition bundle. The unannounced Nord 2 was included in the list of devices supporting the promotion. It has since been taken out. But the promo is running until September 30, so we're thinking the Nord 2 will be announced before then.
Source: Mashable