John Rzeznik. He sings. He writes hit songs. He plays memorable guitar riffs. He cooks.“I’m very good with Italian food; I make unbelievable sauce,” the front man of the Goo Goo Dolls said.“Do I have a secret? Yeah, I dated an Italian girl,” he said and laughed.Does he have other hidden talents?“I can juggle,” he offered.“That’s funny. We were doing a show the other day, and I was like, so the album’s coming out, so please go out and buy it because I really have no other marketable skills. If I have to go out and get a job, I’m going to be in big trouble,” Rzeznik said.Not that he has to fret.