It's not fraud, it's pretty clear marketing. When there was a shortage of wings, they stopped selling those and started selling thighs. Thus, Thighstop. This has literally nothing to do with tax evasion - you really are not understanding what they're doing at all.

> If they decide not to pursue action due to infringement

This is kind of a bizarre thing to say... they are the same company, so there is just not universe in which Wingstop would sue itself.