If you wish to see what Morin says about peregrine planets, you can find his comments in Book 21 of Astrologia Gallica, cited in entries under “Planets, Dignities and debilities of” in the index of Morin’s Book 21, the recently published translation of that book. You can find more on Morin’s use of the terms “peregrine” and “simply peregrine” in note 196 of the Book 21 translation, which also cites the places in Books 15 and 18 of Astrologia Gallica where Morin comments further on peregrine planets. He comments on peregrine planets also in Book 22, Section IV, Chapter 4.