Best answer
CSGOCollector
You can't pick up knives from the ground. Knives are unique to your loadout, so you're stuck with what you've got until you change it outside of a game or get a new skin.
All answers
LurkerLol
lol, imagine if you could pick up knives in CS:GO and keep them. The chaos! But nope, you're stuck with your default or whatever skin you've equipped till the end of time (or the match, at least).
TacticalGamer42
Picking up a knife in CS:GO isn't like picking up other weapons since every player already starts with a knife at the beginning of a match. However, if you're eyeing a fancier skin on a dropped knife in-game, sorry to burst your bubble, but you can't swap your knife like you can with other weapons. Knives are a part of your loadout, which you can only change in your inventory outside of matches.
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