Note that the available distributions are
norm_fit - Normal distribution
t_fit - Student's t-distribution
cauchy_fit - Cauchy distribution
ghd_fit - Generalized hyperbolic distribution
hd_fit - Hyperbolic distribution
sym.ghd_fit - Symmetric generalized hyperbolic distribution
sym.hd_fit - Symmetric hyperbolic distribution
vg_fit - Variance-gamma distribution
sym.vg_fit - Symmetric variance-gamma distribution
nig_fit - Normal-inverse Gaussian distribution
ged_fit - Generalized error distribution
skew.t_fit - Skew Student's t-distribution
skew.normal_fit - Skew normal distribution
skew.ged_fit - Skew generalized error distribution
Also note that the distribution to be fitted from the above list must include the '_fit'.
The function can also fit one distribution to one asset.