They are allowed (https://en.wikipedia.org/wiki/Delta_baryon https://en.wikipedia.org/wiki/Delta_baryon). Also, you need to take into account the overall spin o

They are allowed (https://en.wikipedia.org/wiki/Delta_baryon https://en.wikipedia.org/wiki/Delta_baryon). Also, you need to take into account the overall spin of the particle (may be either 1/2 or 3/2 depending on whether the quark spins all have the same direction or not) and the individual spins of the constituents. Check https://en.wikipedia.org/wiki/List_of_baryons https://en.wikipedia.org/wiki/List_of_baryons for details.