  We use Young tableaux to compute the dimension of $V^r$, the
Prym-Brill-Noether locus of a folded chain of loops of any gonality. This
tropical result yields a new upper bound on the dimensions of algebraic
Prym-Brill-Noether loci. Moreover, we prove that $V^r$ is pure-dimensional and
connected in codimension $1$ when $\dim V^r \geq 1$. We then compute the first
Betti number of this locus for even gonality when the dimension is exactly $1$,
and compute the cardinality when the locus is finite and the edge lengths are
generic.
