That's right: From June 3 to July 2, there'll be a post each day highlighting Teenage Mutant Ninja Turtles canon immigrants. Now, because TMNT canon is a little confusing, it can be hard to tell what counts as a canon immigrant and what doesn't. So for the purposes of this blog, a TMNT canon immigrant is anything (a) from the movies, cartoons, video games, toy lines, or tie-in comic series that later appeared in (b) TMNT volumes 1, 2, or 4 [because they're by the original creators] or TMNT volume 5 [because the original creators are involved, it's the new official continuity, and its goal is to use as much of the diverse TMNT lore as possible].
Wingnut first appeared in Teenage Mutant Ninja Turtles #2 (1989), a mini-comic - 1 of 3 - that came packaged with Ninja Turtles cereal. (Man Ray would also debut in this series.)
Wingnut would later go on to cameo with (most of) the rest of the Mutanimals in Mirage's Tales of the TMNT #58 (May 2009), although it's important to note that this is still the "Adventures" version because it's in a scene of the multiverse. It's also worth noting that Screwloose does NOT appear in this scene.
Wingnut can appear as a hero or villain depending on the continuity, and despite being a Mutanimal, he is actually an alien instead of a mutant. (Now that I think about it, very few of the Mutanimals are mutants.)