1845, Hans Christian Andersen, translated by H.W. Dulcken, Stories For The Household, London: George Routledge and Sons, page 36:
There ran a great broad brook; but the margin was swampy and soft, and here the Toad dwelt with her son. Ugh! he was ugly, and looked just like his mother. “Croak! croak! brek-kek-kex!” that was all he could say when he saw the graceful little maiden in the walnut-shell.
1943, Vera Morris, transl., Thumbelina, Denver, Colorado: Pioneer Drama Service, page 8:
Widow Toad: What do you want me to do about her? Ribbit, ribbit. Brek-kek-kex.
