Once your husband lands as pr, he cannot apply for TRV. He however can apply for a PR travel document. I suggest to apply for PR travel document as soon as you enter the country so that he allow time for processing for document while he is in country. Keep in mind, this applies to those who are from non-visa exempt countries.
If husband is from visa exempt, he can return to Canada with his passport. He has to tell airlines if asked, that he is visiting Canada. Once he reaches Canada, CIC can determine at the border that he is PR.