This package provides density, distribution function, quantile function, and random generation for the Tweedie distribution under the compound Poisson-Gamma parameterisation with power parameter in (1, 2). The density is evaluated using the series expansion of Dunn and Smyth (2005) <doi:10.1007/s11222-005-4070-y>, implemented in C++ via Rcpp and RcppArmadillo for performance. A constructor compatible with the distributional package is also provided for use in tidy modelling workflows.