I found a web site that claims that the Gingwatzim was introduced in AD&D1 - C3 - The Lost Island of Castanamir (TSR 9110). They appear to be native to the Ethereal plane.
Follows is a bit I cut and pasted from another web-site.
Quote:
Gingwatzim, Graegzim (4HD) A noncorporeal creature summoned to The Realm by a powerful wizard. Graegzim have an unarguable mean streak in them, and may be found bound in the form of a humanoid or magical item.
Gingwatzim, Naranzim (6-14HD) The most powerful of the gingwatzim, and the most evil. The naranzim is summoned in the same way as its cousins, but is difficult to bind. The most intelligent gingwatzim.
Gingwatzim, Pakim (2HD) A smaller, less angry gingwatzim than its graegzim cousins. Found in the same forms as all of its brethren: free form, item form or humanoid.
Gingwatzim, Tim (2HD) The least gingwatzim, Tim are merely pranksters.
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Don't know if this is any help to you?