Titounet Titounette Perlin Pinpin

A mysterious series with 18 references and of unknown brand.... We can divide it into two not equal parts. On one side and mainly, Titounet and Titounette, of the other Perlin and Pinpin. Why?
Perlin and Pinpin appeared in the newspaper "Ames Vaillantes" in 1940, then the Edition Fleurus will create the newspaper "Perlin Pinpin" in November, 1945.
Titounet and Titounette appears in the Newspaper "Cœurs vaillants" in December, 1955, then will be integrated into the Newspaper Perlin Pinpin in October, 1956 but not into their stories
In summary, the characters "do not know" between them.
This series is thus later in 1956. It is very likely that it had been proposed through the newspaper. Figures are flat and names are engraved in the back. Three known colors: cream, red and green