No it will not. You get one attack on a charge, just like you get one attack on a standard action. If the girallon used all its claws as one attack, it would be written "claws +12 melee," not "4 claws +12 melee." The girallon must use a full attack action to get all its listed attacks. This is explicitly stated on page 7 in the MM.strongbow said:Since all 4 claws are listed together, a girallon will get all 4 claws even on a charge action.
strongbow said:Since all 4 claws are listed together, a girallon will get all 4 claws even on a charge action.