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We introduce a generalization of bivariate Griffiths polynomials depending onan additional parameter $\lambda$. These $\lambda$-Griffiths polynomials arebivariate, bispectral and biorthogonal. For two specific values of theparameter $\lambda$, they become orthogonal. One of the value is related to theusual bivariate Griffiths polynomials, while the second value produces neworthogonal bivariate polynomials.

$\lambda$-Griffiths polynomials: Bispectrality and biorthogonality