This^
Amphibians, esp. are very sensitive to toxins. Not all pesticides/ferts are going to was wash out right away. You need to wash all the soil from the roots too.
Josh's Frogs and New England Herpetoculture are two good sources. Just remember that tropical plants don't always ship reliably in the winter. I recently had three shipped with heat packs. Two are fine, the third largest showed up in beautiful shape, but has since crashed. Not sure if that one will make it.