Praudhamanorama p199

p199

"In the sense of female frog [are the words bheka etc.]; maṇḍūka, varṣābhū, śālūra, plava, [and] dardura [are masculine for a male frog]"—from the statement of Amara.
Because he has laid down as a convention that there is no dvandva of words of different genders;