Any "New" plant is not safe until it is prepared properly for the enclosure.
They must be cleaned ( roots and all ! ), rinse and re-potted in ABG or tropical soil as they are full of bugs, pesticides, and fertilizer.

A FF search will find you lots of instruction as to how to do this.

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Plants, Plant Care & Plant Identification

The coleus and potato vine - really should not be used they are garden annuals... and will die eventually die. You could plant them in your garden.

The begonia may do ok in a drier area of the tank -- if it has good drainage. They don't mind the humidity....but the roots can't stay soggy.

I would have to look up the cordyline. I think its a large tropical.

Here are some retail plant links. Some on these plants can be purchased in the 'indoor plant' section at home depot, Lowes, or a retail greenhouse:

Plants

New England Herpetoculture LLC - Plants

Live Terrarium Plants For Sale | Josh's Frogs

Lynn