sentences:  Karl is a middle-aged man that looks after Spot and lets him stay in his aquarium.Karl usually acts as the straight man for Spot's and Buddy's antics, knowing the flaws in the frogs' thoughts, but willing to play along with them anyway.Even on the rare occasion when he does question one of their ideas, he does so with a smirk and a raised eyebrow, more interested in their response than anything else.