Ground Turkey is good and safe to eat after the expiration date on the Ground Turkey as long as the Ground Turkey has remained frozen.
The Ground Turkey is safe for 4 days usually in the refrigerator but any longer than that the ground turkey should be frozen to keep bacteria from forming on the ground turkey.
You can keep many meats including Ground Turkey in the freezer for as long as a year and sometimes longer past the expiration date.
The expiration date does not mean the ground turkey is unsafe to eat but just means that it's best to eat the ground turkey before the expiration date for the best taste.
I've kept ground turkey for a year past the expiration date in the freezer and it was still safe to eat.