Question: I would like to use a view field (node reference to an og group, configured to display a teaser) as rendered node inside a view and display the view to anonymous users. 
Do you know how to achieve this result ?

PS. Currently I can display it for admin user but for non-admin users the view field doesn't appear.

Answer: 
If you have the field\_permissions module installed make sure you check the settings for your view field and that the "view any value for field x" is checked for Anonymous users.
Try dumping the node, and see if there are any fields that your anonymous users can't see.