Board Thread:Questions & Answers + Troubleshooting/@comment-26440409-20180806200519/@comment-34742466-20180808044119

Yes, you’re correct - it’s left over from a feature that was removed. When the game had a catalog you had quite a few slots to save frogs of your choosing to buy back later at only 3 times their value instead of 10 times from the Froggydex. It was more useful then because the max number of habitats was 16, I think.