regardless of agressiveness or any other negatives of putting multiple together, you really need to go along with the normal ratio of:
1 frog per 10g's in a show-tank
or 1 frog per 5g's in a breeding-tank
try not to deviate away more than 1 or 2 frogs from the rule. you have a huge risk of one starving another out. if you went with thumbnails you may be able to deviate a little more.