Tagoma thing made no sense to me...
First, he dramatically grew in power from Frieza beating on him, which alone is nonsensical... unless his race is somehow like the Saiyan race, as in capable of receiving Zenkais.
Then you have lots of conflicting statements about his power level before and after Ginyu took control of him.
Terrible character, terribly retold arc.
Beyond being Mystic Gohan level, as the pussy RoF Gohan stated Tagoma appeared to be as strong as he was when he was at his best, it's difficult to say for sure how strong Tagoma really was, before or after the Ginyu possession.
But if Tagona's best is being Z Mystic Gohan level, then Buutenks or Buuhan would beat him I suppose.