Fried Liver attack. It is cheesy.
Cheap Moves

I think I've only witnessed one "cheap move" at chess.
I was playing in an OTB tournament in New Brunswick many years ago. It was raining outside, and the few spectators we had showed up in rain-coats. One of the spectators spent a minute or two examining the position on the board next to mine: Charles Graves vs someone who will remain nameless. After long thought, Charles pushed his King from g1 into the corner at h1, in order to get out of a pin on the c5-g1 diagonal. His opponent immediately made a reply, so it was again Charles' move. The spectator turned around to look at another game... and the tail of his raincoat brushed Charles' King off the board and down onto the floor. Wordlessly, Charles reached down, picked up the displaced King and put it back on h1... and his opponent said "touch-move".
Having just played Kh1 last move to avoid the enemy pressure, Charles now had to move the King back to g1... back into the enemy shooting-range, having lost two moves at a critical point in the game.
Of course, his opponent was legally in the right. Charles should have said "j'adoube" before touching the displaced King. But it was obvious that Charles had no intention of moving the King, so the enforcement of touch-move in this case was pretty cheap. In my opinion.

Touch rule did not apply into that case. Rules say that player must touch the piece with intent to move. Picking a piece from ground does not count
https://www.fide.com/fide/handbook.html?id=171&view=article
Except as providedin Article 4.2, if the player having the move touches on the chessboard, with the intention of moving or capturing:
You are quoting the modern rules. The incident took place about 40 years ago.

Sun Tzu said, "All can see the tactics whereby I conquer, but none can see the strategy out of which victory is evolved."
On a chess board, each player has equal opportunity to see and set traps, and to carry out thier strategy to the best of their ability. With the exception of actual cheating (using an engine, getting others to play your games, etc.), are there any moves in chess that you would consider "cheap" or unsportsmanlike?
When I coached a high school team, the only moves I called "cheap" were the cheap traps meant for newbies but which usually backfired against strong players, like the Scholar's Mate.
I had several players who used to focus on traps and didn't gain ratings higher than 900 until they stopped doing that!
Cheap moves to me is when an opponent is only concerned with exchanging pieces. Everything he does is to exchange, thereby taking any strategy out of the game
It is called the strategy of drawing. Wether you are patzer enough not to punish bad exchanges (if he exchanges all the time probably more than one would be a bad exchange) its up to you.
Read "My System" by Aaron Trumpsowitsch.