Do lots of extra soaks (2-3 a day). If the tort ate it, it could be irritating his insides too. Keep the baby well hydrated. Give aloe and cucumber to eat to help rid his system of the plant quicker. Be sure to go into the garden and identify all the plants to see what is safe or unsafe. Tortoise table can help with that. Hopefully someone else can give you some advice too. I’m not familiar with the stuff you applied.
Just poke a tiny hole to drain it and clean it well applying ointment after. Definitely identify what’s in your garden many plants are deadly so before letting a tort roam you have to know what they’ll come in contact with.