Yes, your friend's frog COULD be impacted, but he could just be a slow little dude who isn't ready to poop just yet. Has he tried a warm bath for an hour or so? I found a 15 minute bath wasn't long enough to get my froggy's pipes working, but a longer bath did the job. Make sure the water is shallow so he doesn't drown. Remind your friend of that. And yes, that hard lump could mean impaction. Might be the wrong side, can't remember, but many threads here on the subject have expert replies that will tell you if it's the left or right side. It's whichever side his stomach is on internally. Anyway, a week isn't super worrying. Even humans can go a week without pooping, no problem, and frog metabolism is slower than ours. Just keep him stress free and repeat the baths every now and then and hopefully it will work out the natural way. And of course, I am no expert, so wait for Carlos to come back, or someone else you respect.