Native Norfolk herpetofauna include the adder (Vipera berus); barred grass snake (Natrix helvetica); slow worm (Anguis fragilis); common/viviparous lizard (Zootoca vivipara); common frog (Rana temporaria); common toad (bufo bufo); natterjack toad (Bufo calamita); great crested newt (Triurus cristatus); palmate newt (Lissotriton helveticus) and smooth newt (Lissotriton vulgaris).
Norfolk is also the reintroduction site for the native pool frog (Pelophylax lessonae) which became extinct in the UK. A 2005 reintroduction project saw specimen brought over from Sweden to re-establish a UK population, a second population has since been establised. This work has been undertaken by the Amphibian and Reptile Conservation Trust.
Like many other counties, Norfolk is also home to populations of non-native herpetofauna species. It is important to monitor these species to study their impact.