[scotteh]

It's absolutely possible. Admittedly I'm still running 2.1.18, but I just tested it there and it still works.

https://ngrok.com/docs#subdomain

edit: Just in case, I updated to 2.2.4 (newest) and it's still possible to use custom subdomains.

[conqrr]

This doesn't work. I just checked.

Tunnel session failed: Only paid plans may bind custom subdomains. Failed to bind the custom subdomain 'blahblahblah' for the account xxx

[scotteh]

Strange. Did you have the account back when it was still possible? They may have grandfathered the older accounts in.