Toby the merboy is a character in a sidestory in a TV-show Yo Gabba Gabba! He appears in Season 4, Episode 5, entitled "Mermaids".
Toby found a baby dragon and befriended it. He took him home with him, but the dragon grew too big, and his parents told him to get rid of it. But after the dragon saved toby's life, his parents allowed him to stay with them.