the first bike is a DP Harris Hardware & Mfg Co. (the makers of Rollfast... well, actually, the W.P. Snyder Co made the bikes, Rollfast was just one of the brands Harris used.)
it looks like a late 30's bike. if you look close, the chainsaw motor is ziptied on there, and there's no drivetrain for it. it was probably just something someone mocked up in the store because it looks cool. fits right in.
that being said, i'd totally buy that bike for the right price. it's pretty rare.
the second bike looks like a Monark, judging by the "kink" in the middle tube. that one looks like it usedta run at one time, maybe it still does?