Ducklett is an aquatic bird-like Pokémon that looks like a cygnet (a baby swan). Its upper body is aqua/light blue in color and the lower half is sky blue. On its head is a heart-shaped, feather-like protrusion. Its bill and feet are yellow.
Ducklett is based on a cygnet (a baby swan). Due to its evolution's resemblance to a swan, Ducklett's appearance is probably based on the Tale of the Ugly Duckling where an unattractive duckling grows into a beautiful swan.
Ducklett's English name may be a corruption of "ducklet", and "cygnet", possibly combined with wet or -ette (suffix meaning small).