Found a nice process for creating oak trees in blender

Add a skin modifier, ctrl+right click in vertex edit mode to extrude verts, "O" to use proportional editing (mouse wheel to adjust radius) and ctrl+A to scale the radius. Add a subdivision modifier for extra smoothing, a displacement modifier with some clouds for a little roughness, then, in a separate collection, create a mesh and put the boolean modifier on it, set to union, and use the tree parts collection as the targets to be booleaned. Finally, a decimate to cut down on the poly count.

Skin modifier is a bit flakey, so sometimes you just have to tweak things a bunch until you don't have holes/freakouts in your mesh. Just need to add twigs and leaves! Oh, and Fist of the Forgotten is the project I'm building with this, if anybody was curious.