Froggy is 1 week usable event however if you use it on the last day, you can still collect your rewards as the extend it's finale to be 2 weeks. For example, i use the 12k ingots to get the highest coupons in froggy on the last day of the event, i can still collect for 6 days after the event closes. However let's say on day 8th i wanted to do the 5k ingots as well, i won't be able to do so. This is to help you understand the event is 2 weeks, but the buy-in is closed a week into the event.

Not true, Froggy was a week prior to fuku, the event (froggy) just takes 2 weeks.

Well first of all, there's survey's in which you can take part in to show your dissatisfied with the current on-going or the last few events. Don't clog the entire reply comments about weekly events all because you don't like the events. Some people still enjoy those events. They're doing as much as they get giving on, if you want to make something happen, make a post about it or take it to customer service, either way feedback will then be appreciated.

The whole point of the other events is to spend coupons to get fragments, and you complain about getting more than 50% of the ninja for free, if you want the ninja you will earn it through a grind like everyone else lmao