Hello and welcome to FF ! Sorry missed answering your first thread . Guess your fears went the other way and it was your Betta who strangely got bullied out. Amano shrimp are not tiny (males 1 in, females 2) so unless you get babies ADFs can't eat them. That does not mean they won't harass them and if they bothered a Betta; might try the shrimp too.

Recommend you read about Amano's because they are not an easy shrimp to keep. They are challenging to breed captive, so majority are wild sourced which means possible parasite vectors and a bigger challenge to keep alive due to capture, holding, and distributing factors. You already have a Betta and 2 frogs in planted tank, maybe should call it a done thing and enjoy as is .