We call these babies « croustillons » and those are typical carnival donut here in Belgium.
Making the dough is super simple;
250gr of flour
150ml of tepid milk
1 egg
7gr of dry yeast
20 gr of sugar
20 gr of softened butter
4gr of salt
1 small pack of Vanilla sugar
Beat the crap out of it for about 5 mins

And after a while it has doubled its volume:

Deep fried for a couple of minutes

And then add a lot of icing sugar -------


We’d call these bunyols de vent in Catalonia. Wind fritters, apparently (not sure about the fritter bit, but seems to be the closest to bunyol I can find, so it’ll have to do, because I don’t think I could call them doughnuts).