Do you mean these horizontal figures? I canāt find an English translation. They where used to decorate the outlet of the rain gutter. But the rain gutter is somewhere else.
George
Thatās a good start, at any rate ā¦
The English would be āgargoylesā 
A quick Reddit search taught me something else;
āGargouillerā is an old French that means to gurgle, from the old word for throat, āgargouleā
Apparently they fell out of popularity because some found them frightening and the heavier ones fell off, causing damage.
That could be why @gserim appears to have a garden statue of a dog as the first gargoyle in that picture 
Oh, they could also be Weeping Angels, of courseā¦
Ha, ha, the dog is historic. But there are other gargoyles ā¦
The Dutch word is waterspuger. It contains water and the verb to spit. It spits the water preventing it coming down via the wall. Later rain pipes where used. Also on the picture.
A picture from a ,modern, churh in Lille,France. You can see the whole in its mouth.
George
I think this is a fairly standard practice among stonemasons. The guy who redid the heads in front of the Sheldonian theatre in Oxford (itās where degree ceremonies are held) modelled them on the then heads (there is no standard title: Rector for my college, Warden for All Souls, Master for thersā) of Oxford colleges. Donāt know who was more offended: the chaps whose heads were displayed or those passed over.