Not wishing to embark aboard the recurrent tool/weapon saga, i suspect this time the Canary knife was undoubtedly conceived to be an agriculture utensil, eventually having undergone design adjustments for banana harvesting, for one. Its connotation with the term Nife, from the English Knife to the Spanish, even Portuguese slang Naifa, ought not transform this tool into a weapon.
If you guys care to translate this article to your own language, you have a good chance for such subject perusal.
https://es.wikipedia.org/wiki/Cuchillo_canario