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You want to use Roy Lichtensteins comic font that he used in his speech bubbles? One was created by Albright-Knox Art Gallery: “P22 Pop Art Comic“

According to Fontshop
“The Pop Art font set was developed for the Albright-Knox Art Gallery in Buffalo, New York. The Comic typeface, in regular and bold italic, was inspired by the work of Roy Lichtenstein, whose crisp, clear caps were distinctive but legible.”

You can buy it for example here:
Fonts.com

Dont want to pay? Here are loads of free alternatives:
hans.presto
Blambot
manfred-klein

“Laffayette Comic Pro” is fairly similar:
dafont