A female bullfrog may lay 10,000 eggs that hatch into these, which may take 2 years to grow into bullfrogs
[DOC] [TLE] Commercial Frog Farming - Publications and Educational Resources [PAR] Bullfrogs lay their eggs in shallow standing water during the Spring (April ... 
female may cover an area about 3-5 feet square and include from 10,000 - 
25,000 individual eggs.