Mojave is incomplete dominant because the heterozygous form is a completely different phenotype from the homozygous ("super") mutant allele, and it is different from the homozygous normal allele. Same goes for lessers.
Also, all lessers and mojaves are both hets, but calling them hets is redundant since "het mojave" means "mojave", and "het lesser" means lesser. The term het does not mean hidden, it simply means heterozygous (homozygous refers to either the super or the normal animal). You are however very correct that they are not dominant to each other.