Yes, for many titles a preview is available.
If you tap on the thumbnail of any title in the Main Screen or the Browse screen LingoZING! will take you to the Title Details screen. Here you will see the title’s title page, a few screenshots, details of its reading level and supported languages, a synopsis, as well as credit details such as its publisher, the series, its creator and its genre classification. If a Preview is available there will be a PREVIEW button underneath the screenshots.