If it was cigar shaped it was most likely poop. Poop disintegrates easely depending on the diet of the frog. For instance, I feed mainly nightcrawlers, dubias & locusts. Of the nightcrawlers and dubias, I don't see anything in the poop, but from the locusts I recognize tiny parts.
It's easy to check if your frog has to poop or not, just take a look at the frogs right side, is it bigger then the left? If your in doubt, still give a honey bath, theres no damage doing one anyway.