Just being blunt: that's called Fraud. Making false representations for personal gain (employment, in this case) is one of the classic examples.
It doesn't matter if nobody checks in the moment, or if you usually get away with it, dishonesty is dishonesty. If I were to discover that someone joined my team under false pretenses, you can bet I'll have very little faith in their credibility going forward.
https://www.justice.gov/archives/jm/criminal-resource-manual... :
> The Fourth Circuit, reviewing a conviction under 18 U.S.C. § 2314, also noted that "fraud is a broad term, which includes false representations, dishonesty and deceit." See United States v. Grainger, 701 F.2d 308, 311 (4th Cir. 1983), cert. denied, 461 U.S. 947 (1983).