in the spin off series diary of the a wimpy hamster manny heffley gets a hamster and names it cheekumz. there are six books in the seires first theres diary of a wimpy hamster. second the ball in the ball manny gets a cat and names it feefleep.feefleep treats cheekumz like rodick treating greg badly.the third the feefleep trap.in this book feefleep tricks cheekumz to get into fregleys house. but cheekumz tricks feefleep back.in the fourth camp grandpa cheekumz feefleep greg rodick and manny go to grandpas for the summer.in the fifth book family reauion they all go to hawiil for a family reasuion and feefleep ruins it for cheekumz. in the sixth the d.i.y its a do it yourself book only made because cheekumz was bored.