Not really. In Mathematics "circle" refers to a boundary of a disk. So it's a 1D periodic manifold, and the circular harmonics/Fourier series are the basis for such periodic functions. The bessel functions give a basis for the radial part of 2D solutions to a certain class of differential equations on a 2D disk. Incidentally the radial part of those solutions are circular harmonics.

No. Bessel functions are the solution to many differential equations posed in cylindrical coordinates.

Legendre polynomials are what we are seeing here which are solutions to many differential equations posed in spherical coordinates.

Classical sine/cosine Fourier solutions are the solutions to many differential equations posed in cartesian coordinates.

So these spherical solutions should also remind people of atomic quantum "orbital" shapes because those are solutions to Schrödinger's (differential) equations in spherical coordinates.