1746 tr. H. Boerhaave V. 247 In the Frog-kind nothing is communicated from the Male to the Female but a small Animalcule or Worm.
1832 W. D. Williamson I. 169 Of the Frog kind are six species:—1. the Toad; 2. the pond Frog, [etc.].
2000 R. G. Millikan ii. 24 Similarly, she learns about frogkind by dissecting one frog.