no, this is about 100% unture. FBT are aggressive animals, and WILL bite and sometimes maul FBN. their have been MANY reported cases of newts that have had legs and tails bitten off and most of the time, that ends with death.
also, with cories, not only do they need to have more then 1 in a group, they will also kill frogs if ever injested (which is likely to happen). a beter stocking list would be a group of 3-6 white cloud mountain minnows or a trio of rosy red minnows (tropical fish will need heated water, frogs need cool water).