  New convolution identities for orthogonal polynomials belonging to the $q=-1$
analog of the Askey-scheme are obtained. A specialization of the Chihara
polynomials will play a central role as the eigenfunctions of a special element
of the Lie superalgebra $\mathfrak{osp}(1|2)$ in the positive discrete series
representation. Using the Clebsch-Gordan coefficients, a convolution identity
for the Specialized Chihara, the dual -1 Hahn and the Big -1 Jacobi polynomials
is found. Using the Racah coefficients, a convolution identity for the Big -1
Jacobi and the Bannai-Ito polynomials is found. Finally, these results are
applied to construct a bilinear generating function for the Big -1 Jacobi
polynomials.
