U.S. equities will need strong earnings results to continue their remarkable comeback since hitting their 2016 lows last month, Prudential Financial's Quincy Krosby said Tuesday.

"Whether or not you think Janet Yellen is going to be accommodative, … the fact is we're moving closer to where we need growth. We need fundamentals, we need revenue growth to pick up," the firm's market strategist told CNBC's "Squawk Box."