Ooh German has -chen which must be related to the Dutch -tje. Same diminutive effect, although I've only seen it used to transform certain words that are recognised by the dictionary (e.g. Mädchen - girl, Ampelmännchen). I'm sure that anyone could use it for patronising/comic effect, however. A nice (or annoying) benefit of this diminutive is that it changes the gender of the word to neuter. So Mädchen has neuter gender even though it is obviously describing something feminine. That really bugs beginners, but the tendency for endings to dictate gender is on the whole a useful one because the language doesn't really give you any other cues.