o ▁of ▁ad oles cent ▁din osa urs , ▁who ▁first ▁appeared ▁in ▁The ▁Land ▁Before ▁Time ▁III : ▁The ▁Time ▁of ▁the ▁Great ▁G iving , ▁in ▁which ▁they ▁often ▁quar rel ▁with ▁Little foot , ▁C era , ▁and ▁the ▁others . ▁It ▁is ▁also ▁imp lied ▁near ▁the ▁end ▁of ▁the ▁film ▁that ▁Hyp ▁the ▁gray ▁din osa ur , ▁behav es ▁in ▁this ▁manner ▁because ▁of ▁the ▁ag gress ive ▁treatment ▁he ▁receives ▁from ▁his ▁father . ▁His ▁lack ey , ▁M utt ▁the ▁green ▁din osa ur , ▁is ▁shown ▁to ▁be ▁much ▁so fter - heart ed , ▁as ▁well ▁as ▁dim - w itted , ▁whereas ▁Hyp ' s ▁other ▁lack ey , ▁N od ▁the ▁green ▁din osa ur , ▁frequently ▁emphas izes ▁Hyp ' s ▁statements , ▁as ▁well ▁as ▁allowing ▁him ▁to ▁ride ▁on ▁his ▁back . ▁They ▁become ▁friends ▁with ▁the ▁others ▁after ▁all ▁eight ▁co oper ate ▁against ▁a ▁pack ▁of ▁" F ast ▁Bit ers ". ▁ ▁The ▁tri o ▁appear ▁again ▁in ▁the ▁season ▁one ▁finale ▁of ▁the ▁television ▁series , ▁" The ▁Great ▁E gg ▁Advent ure ." ▁ ▁In ▁the ▁film , ▁they ▁were ▁vo iced ▁by ▁Whit ▁Het ford ▁( H yp ), ▁Jeff ▁Ben nett ▁( M utt ), ▁and ▁Scott ▁Men ville ▁( N od ). ▁In ▁the ▁TV ▁series , ▁Ben nett ▁and ▁Men ville ▁res ume ▁their ▁roles , ▁but ▁Hyp ▁is ▁vo iced ▁by ▁Mi key ▁K elle y . ▁