Splitting wood with a froe, or wedges, or anything else that mechanically forces the wood apart will work for sure, but the splits will follow the easiest path through the log, so they split following the grain. A froe is really just a long slender wedge, after all, with a lever built into it.
If it's straight grain they will split more or less straight, but if not you won't know what you're going to get until you've got it.
I split smaller stuff with a wedge or maul sometimes, but bigger stuff is easier for me with the chainsaw, especially since I trim the corners off with the same saw and then the blank is ready for lathe mounting without any more ado. That's just my method though.
If your saw is underpowered and you have a log where you suspect wandering grain will give you trouble, you can score the log all around, as deep as you have patience for, to try getting control of where it separates when you split it.
A froe is pretty easy to get stuck in a hard-to-split log, then you have to knock it out and generally wrestle things around. A pain in the neck. Wedges really are more versatile, especially if you have several, so if one sticks you can bang in another somewhere.
It's easier and less frustrating driving another one in than wrestling to get one out.
Some species split easier than others of course, but you know that already. I run through a fair amount of cottonwood, for example, which is next to impossible to split by wedging. Hand grenades maybe, but haven't tried that yet.