A tick generally refers to one run through the game loop in which all the logic is computed, so games generally have multiple ticks per second.
However, many games run both the graphics and game loop on the same thread because the graphics usually don't take so long to display so that logic is interrupted, or vice-versa (although developers put checks in place for situations like that, like taking the difference in time between the last and current frame and adjusting the rate of movement accordingly).
FPS stands for Frames Per Second, so for many games, yes, technically speaking, each frame is one tick.
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