Hi Lyndsay! Well, looks to me you will need to either get more tanks or re-home some frogs soon . The Leopard Frog will need anywhere between a 20L to 30G if male and up to 55G if female. Area is more important than height and a 1/3 dry to 2/3 wet enclosure is recommended.

The Bullfrog will need still bigger tanks, specially if female, with same kind of mixed set-up.

For the Grey; height over area is preferred and can find more info here: Frog Forum - Gray Tree Frog Care and Breeding .