Simple enough, just some additions to pad out the Ranger spellbook. I think these spells are rather fitting for the Rangers Nature Themes. Blood Frenzy in particular fits the glass-cannony playstyle quite well. In terms of balance - Rangers spell-slots are so slim, as is, I can imagine there won't be a high uptime on Frenzy.
Faerie Fire is presently in the Spellsword Book, anyways, so, I can't see it being an issue.