Spot the Frog was a nationally syndicated newspaper comic strip written by Mark Heath.
Spot is a talking frog that wishes to move away from his home pond and seek broader horizons.
Although he lives indoors with Karl, he still spends a great deal of his time at his old pond with his friends, and this is where much of the comic takes place.
He claims to be a natural frog, uncomfortable with human trappings, even though he wears glasses (and a hat during the winter) and watches television through Karl's window.
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.
He also protects them from more harsh dangers as well, though for the context of the comic's light tone, these instances are incredibly rare.
Bull is a pond frog with a large mouth, known for speaking in very loud tones (often for comic effect).
She's named after a megaphone, but that moniker is mostly ironic, as she's the complete opposite of bull, being very quiet and roughly half the size of the other frogs at the pond.
Spot spends a great deal of his time with Kay trying to relieve her of her phobia, often with less than ideal results.