For the record, when we we there Kronberg had the following European herps:
European Pond Terrapin
Hermann's Tortoise
Spur-thighed Tortoise
Common (Viviparous) Lizard
Sand Lizard
Slow Worm
European Tree Frog
European Yellow-bellied Toad
Natterjack Toad
European Green Toad
Common Spadefoot Toad
Common Midwife Toad
Alpine Newt
Palmate Newt
Smooth Newt
Fire Salamander
Alpine Crested Newt
Great Crested Newt
Danube Crested Newt
The two tortoises and the tree frogs were elsewhere, but as I recall the others were all labelled in this complex of four mixed exhibits - not that we saw many! Any that weren't in these would have been in terrariums around the Zoo School in the background here.
(I wouldn't often have this much detail, but we had someone with us who is very good at note-taking!)