There Once Was a Dragon Named Meatlug

There Once Was a Dragon Named Meatlug is a short song that Fishlegs sings to Meatlug in the episode "Gem of a Different Color" while they're relaxing on an island that will soon be identified as Changewing Island.

Lyrics
There once was a Dragon named Meatlug She was cuter and smarter than a sea slug Until she met her pal Fish Who fulfilled her greatest wish To love her and give her a big bear hug.