Though I have never seen the term "frivolous appeal" used. I guess if a party decides to appeal a decision to the appeals court knowing the appeals court has no jurisdiction over such issue, one can call it a frivolous appeal.
Even in those cases the appeals court still explained in detail why they did not have jurisdiction over such issues.
FRom the CAFC rules:
Rule 38. Frivolous Appeal — Damages and Costs
If a court of appeals determines that an appeal is frivolous,
it may, after a separately fi led motion or notice from
the court and reasonable opportunity to respond, award just
damages and single or double costs to the appellee.
Practice Notes
Warning Against Filing or Proceeding with a Frivolous Appeal or Petition. The court’s early decision in Asberry v. United States, 692
F.2d 1378 (Fed. Cir. 1982), established the policy of enforcing this rule vigorously. Since then, many precedential opinions have included
sanctions under the rule. Damages, double costs, and attorney fees, singly or in varying combinations, have been imposed on counsel,
parties, and pro se petitioners for pursuing frivolous appeals.
Challenging a Frivolous Appeal. If an appellee or respondent considers an appeal or petition frivolous, the appellee or respondent must
fi le a separate motion with that allegation. The assertion that an appeal is frivolous must be accompanied by citation to the opposing brief
or the record below with clear argument as to why those citations establish that the appeal is frivolous. A party whose case has been
challenged as frivolous is expected to respond or to request dismissal of the case.