Is it possible to add google recaptcha to forms add on?
You don't really need this and its not at all user-friendly. Its much better to use the honeypot that's built into the Forms App, and supplement it with Akismet if necessary. We have the Forms App running on many websites and these 2 'systems' protect the form from almost every misuse - but the forms are still user-friendly.
so honeypot is already bult in? I don't need to do anything to activate, correct?
Take a look at https://docs.grabaperch.com/addons/blog/spam/
Although its in the blog documentation, it apples to Perch Forms too.