KEY POINTS
  • "Please be careful when you see a reference in Twitter which says we're taking up Hertz or get on board the Chesapeake train," Jim Cramer said.
  • In recent days, traders have bid up the stocks of companies that have filed bankruptcy or are expected to do so soon.
  • "Fractions is a great way for people to learn how to buy an Amazon or how to buy an Alphabet, so I just wish that they would switch the direction from companies that may be bankrupt or overvalued," Cramer said. 

CNBC's Jim Cramer cautioned investors on Tuesday to avoid the risky stocks favored by day traders these days amid rampant speculation in the market.

"I've never seen so many games played with stocks, which is that, 'hey, we're taking this one up today. We're taking that one up today,'" Cramer said on "Squawk on the Street."