Froot and
frunk are both in Wiktionary, with some supporting quotations. They haven't made it into any other dictionaries yet as far as I can see.
On the occasions when these words are used, they're often in quotes, and with an explanation of what they mean - an indication of how new these words are. For example, in
The Times (UK) in May 2019:
There’s room in the back for three adults, although headroom could be an issue, and a combined 425 litres of storage in the boot and “froot” — front boot.
Having said that, there are some examples going back to 2012 (
froot) and 2003 (
frunk).
Evidence on the extent of use of the word
froot is hard to come by because of Froot Loops, but
frunk shows a flurry of examples from 2019 onwards.
Both these words will be accepted in future as rare words.