Hello and welcome to FF! Your frogs and set up look very nice. Couple issues you should consider are that, same as with fish, will need to quarantine the new frogs from the healthy ones you have. Also, all frogs sizes should be similar to avoid a larger frog eating a smaller one.

Once those challenges are met; you should be able to introduce them in the in the 30B. Careful with feeding freeze dried food to ACFs; some have caused digestive issues. Thawed out frozen gammarus or similar should be OK .