Prefrontal scales
From Infogalactic: the planetary knowledge core
The prefrontal scales on snakes and other reptiles are the scales connected to the frontals towards the tip of the snout which are in contact with the internasals.
See also
References
- D.C. Wareham. Elsevier's Dictionary of Herpetological and Related Terminology. Elsevier, Jan 19, 2005 pg. 160