In Denmark, the humorous Valentine’s Day letters sent anonymously are called gaekkebrev, more precisely written gækkebrev.
A gækkebrev is a Danish “snowdrop letter,” a playful anonymous message traditionally decorated with cut-paper patterns. The sender often writes a rhyme or riddle but leaves out their name, replacing it with dots. The recipient must guess who sent it. If the guess is wrong, the recipient traditionally owes the sender an Easter egg; if the identity is guessed correctly, the sender may owe the egg instead.
Although the custom is especially associated with Easter, modern descriptions often connect these anonymous, humorous letters with Danish Valentine’s traditions as well. The word is sometimes rendered as gaekkebrev when Danish letters such as “æ” are converted into plain ASCII spelling. That spelling difference does not indicate a different tradition.
A common mistake is to translate the term simply as “love letter.” A gækkebrev is defined by its teasing anonymity, rhyme, and guessing game, not necessarily by a serious romantic confession. It can be sent to friends, family members, or a romantic interest.