In which case I'd say just keep your frog in quaratine for the recommended month, observe the droppings closely. You want them to be a solid shape, not runny. Use a tooth pick to look through a couple of fresh droppings with a magnifying glass to check for worms. This is a gross step, but can be very important.
Feed your frog daily to see if it will gain weight. If you're feeding it often but it never gains weight or gets skinnier you could have a potential problem. If you feed daily they will go to the bathroom daily, make sure of this and spot clean frequently.