Beautiful frogs! (Didn't that delivery guy know what precious cargo was inside?) i think that putting the medicine would be a good idea. You can never be too careful. You could offer crickets tonight but be mindful that they are probably very stressed out and it will only scare them more the idea that a giant (from their eyes) person would be looming over them so if they don't immediately go for it then leave them be till tomorrow. Other than that and the fact that they look very underfed they look amazing and i hope that they have a long and happy life under your care! Congrats