umm do u mean the corn snkes themselves smell or the viv they are in smells? (sorry didnt quite get which one you meant from your post). if it is the viv it could be that the corn had hidden the poo some where mine quite often does that.
As regards to having fun im not really sure what snakes do for fun or even if they do like to chill and play. ive got my adult corn snake some vines for his viv which he loves to climb around on, also i assume my snake enjoys burrowing through his substrate so i always try to give a thick enough layer for him to burrow through. you could try either of those for your corn though i dunno how old they are but u mite want to only put small branches or vines in since they are only young and dont want them getting hurt.
hope that helps if any more questions just pm me