I've pitched a tent a couple of times up in the Ferret and its been fine. Both times I've continued up the road past Frebouze to the bridge that's used for the Gervasutti bivi approach (about 1730m). Just beyond are a few bins in a lay-by on the right. Its flat all around there and for the next 500m up valley. The river is also alright to have a dip in around there! Beware though, that lay-by is where the heli picks up loads to be taken up - better to continue up valley for a few hundred metres to where there are a few trees. The only thing to mention is the day-night barrier at the entrance to the valley. This limits how useful it is. Hence I've only used it when we've come down from long routes absolutely knacked and not with the intention of getting out early the next morning!
At the other end of the spectrum, Camping Sorgente (Val Veny) is sublime! Trees or sun, hot tub, mini swimming pool, shelters and bbq, microwaves etc.. Definitely the best place to rest if out for a while!
EDIT: autocorrect isn't much use for Italian valley names...
Post edited at 15:33