Noun
amplexus (uncountable)
A form of pseudocopulation, found chiefly in amphibians and horseshoe crabs, in which a male grasps a female with his front legs as part of the mating process.
Of the seven amplexus modes (positions in which frogs mate), these frogs are found breeding in inguinal amplexus, where the male clasps the female in front of the female's back legs and squeezes until eggs come out. Source: Internet
These include the development of special pads on his thumbs in the breeding season, to give him a firm hold. citation The grip of the male frog during amplexus stimulates the female to release eggs, usually wrapped in jelly, as spawn. Source: Internet