Can I substitute almond meal for breadcrumbs in meatballs?
Go right ahead and use the almond meal. 

In its list of uses for almond meal, this source says:


  Use almond meal in place of breadcrumbs in meatballs.


In fact one of the recipes on the site is for Meatballs Parmesan. It calls for ground meat without specifying a type, so I assume your turkey would be fine. 

In addition, the description of this
almond meal product states the following:


  Use almond meal in place of bread crumbs in meatballs, or as a coating for chicken and fish.