I can't guarentee correctness, but here are my answers:
(left to right)
Period 1: Pfsst, Bombal
Period 2: Chow, Doggone, Ernst, Floxxit, Goldy, Nuuyte, Apstrom, Logon
Period 3: Byyou, Zapper, Yazzar, Highho, Magnificon, Oz, Kratt, Jeptum
Period 4: Quackzil, Doadeer, Rhaatrap, Terriblum, Sississ, Urrp, Volcania, Wobble
Period 5: Xtalt, Pie, Anatom, Elrado