ChessTempo.com calls both of these as Vukovic Checkmates.

This game collection was gathered by ChessCoachClark. He also wrote the following notes:

Vladimir Vukovic showed two versions of a particular kind of Knight and Rook checkmate pattern in his book, THE ART OF ATTACK IN CHESS, Chapter 4: Mating Patterns, under "Typical Mates with Enemy Pieces," page 72. It was not labelled with a name there, but several chess writers have identified it as the Hook Mate. IM Vukovic declares it to be "a typical mating pattern well worth remembering." I have managed to use it in OTB play and like to introduce it to students as well.

One version of the Hook Mate, which I think of as a slash/swoosh, as given by IM Vukovic, is as follows:

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I use the code <SW> for this version of the Hook Mate.

Here is the other version, which seems to resemble a sickle or question mark (without the dot at the bottom), as provided by IM Vukovic:

click for larger view

I use the code <QM> for this version of the Hook Mate.

Note that the Pawn could be on either diagonal "behind" the Knight (away from the opposing King). This point is significant because the SW and QM versions differ only by the positioning of this Pawn.

The code <IV> is for Interesting Variations, those games which do not fit either of those previous types. Most often, a chess piece (not a Pawn) protects the Rook, even from a distance.

This Hook Mate game collection only has games with the defending King and the attacking Rook in the same file, i.e., a vertical orientation. Of course, this mate could occur with King and Rook in the same rank-- horizontal configuration. For example, check out this game, if you can:

Rouse, Philip vs Henke, Simon
Corr. 2001 23 moves 1-0

CG just doesn't have it in their database, yet.

Also, there is a game between two girls in the semi-finals of the Ukrainian championship for U14 that ends with the Hook Mate in the horizontal orientation. Again, it is not yet a part of the CG database:

Poshivaylo, K. vs Breslavskaya, Galina
Lvov, Ukraine 1999 32 moves 0-1 <SW>