Interestingly, most appear to be sound-symbolic, with smaller pond frogs having something like *wark as an underlying form (many ovbviously have undergone historical changes).
(most; to be; sound-symbolic) (smaller pond frogs; having; something like *wark) (an underlying form; have undergone; historical changes; T:ovbviously)
most smaller pond frogs an underlying form
to be having have undergone
sound-symbolic
something like *wark
historical changes T:ovbviously