Giroud was a comics writer. He wrote the text for "Louis la Guigne", drawn by Jean-Paul Dethorey. He also wrote the text for "Mandrill", drawn by Barly Baruti, as well as "Oubliés d’Annam" and "Azrayen", drawn by Christian Lax. In 2000, he created "Le Décalogue", published by Glénat Editions.