Hi Xavier,
Yes they are. Where these two species ranges overlap in France, they do hybridise naturally, but they are less fertile than the parents.
They were once thought to be a separate species.
There is an image of an "Adult (male). Hybrid Triturus cristatus carnifex X Triturus marmoratus (hybrid Triturus cristatus male X Triturus marmoratus was described as a new species, Triturus blasii De l'Isle, 1862)." taken by Paolo Mazzei on his site: http://herp.it
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