I'd just keep an eye on the tank and pluck them out when you see them... at 1/3" thats very tiny and if you remove some of your plant cover I'd agree your mollies would likely go for them.
I think the mollies would eat them if they found them, but the floating plants are really dense. There is a cover on the tank, it would have had to come in around the HOB. I may tray removing some of the plants and see it that would make them "more available" to the fish. I don't see anymore on first glance, but since this is the second, I assume there are more (unless the fish DID eat them........)