Amount of damage depends on the number of frogs you have caught.
Frog Drop is one of the first Blue Magics available by eating a Gigan Toad. It costs 10 MP to cast.
The amount of damage that Frog Drop may do is as follows:
With this in mind, it is possible to easily get Frog Drop to deal 9,999 point of damage, making it one of the four strongest attacks in the game, tying with Zidane's Thievery, Beatrix and Steiner's Shock, and Freya's Dragon's Crest. If Quina has caught no frogs, the spell deals 1 HP damage.
Frog Drop takes its name and design from the Chrono Trigger tech Frog Squash; both are written identically in Japanese. The ability in Chrono Trigger also involved summoning a giant frog to land on the enemies. In addition, the appearance of the frog that is summon during the ability in Final Fantasy IX is similar to the Frog character from Chrono Trigger.