Yes, you can freeze marinated tempeh. You can freeze the marinated tempeh in a freezer safe bag or container for up to 3 months. You don't want to leave it in the freezer any longer than 3 months or it'll get freezer burned and have an unappealing taste. Alternatively, you can freeze the simple marinade separately from the tempeh. Occasionally, freezing tempeh can cause the texture and consistency to change when it has thawed again, so take caution in freezing unless necessary.