After you thaw the ground turkey it can stay safely in the refrigerator for up to 5 days max before going bad.
If you want to keep the ground turkey longer than 5 days then it needs to be frozen otherwise it will spoil and have to be thrown out.
If you use it within 5 days though the ground turkey can safely be refrigerated for up to 5 days.
The ground turkey will be bad if it has a slimy texture or a bad sour smell to it but if it smells good and doesn't have a slimy texture then it's okay to eat.