The prefrontal scales on snakes and other reptiles are the scales adjacent and anterior to the frontal, towards the tip of the snout, which are also in contact with the internasals.

See also Snake scales Scale (zoology)

References Wareham DC (2005). Elsevier's Dictionary of Herpetological and Related Terminology. Amsterdam: Elsevier. 240 pp. . ("PREFRONTAL", p. 160).