  The origin of the spin liquid state in Tb$_2$Ti$_2$O$_7$ has challenged
experimentalists and theorists alike for nearly 20 years. To improve our
understanding of the exotic magnetism in Tb$_2$Ti$_2$O$_7$, we have synthesized
a chemical pressure analog, Tb$_2$Ge$_2$O$_7$. Germanium substitution results
in a lattice contraction and enhanced exchange interactions. We have
characterized the magnetic ground state of Tb$_2$Ge$_2$O$_7$ with specific
heat, ac and dc magnetic susceptibility, and polarized neutron scattering
measurements. Akin to Tb$_2$Ti$_2$O$_7$, there is no long-range order in
Tb$_2$Ge$_2$O$_7$ down to 20 mK. The Weiss temperature of $-$19.2(1) K, which
is more negative than that of Tb$_2$Ti$_2$O$_7$, supports the picture of
stronger antiferromagnetic exchange. Polarized neutron scattering of
Tb$_2$Ge$_2$O$_7$ reveals that at 3.5 K liquid-like correlations dominate in
this system. However, below 1 K, the liquid-like correlations give way to
intense short-range ferromagnetic correlations with a length scale related to
the Tb-Tb nearest neighbor distance. Despite stronger antiferromagnetic
exchange, the ground state of Tb$_2$Ge$_2$O$_7$ has ferromagnetic character, in
stark contrast to the pressure-induced antiferromagnetic order observed in
Tb$_2$Ti$_2$O$_7$.
