Is this anthracnose on these
Norway Maples?

No this is not anthracnose. It looks like a little bit of sunscald, basically a sunburn on the leaves. Additional irrigation may help prevent this in the future. These leaves will fall this autumn and next year the tree will have new leaves.

Related Videos:
Effects of Sunscald
Why are my maple trees’ leaves turning brown and dying?
Bacterial Leaf Scorch

Related Resources:
Environmental Injury: Sunscald and Sunburn on Trees
Sunscald Injury or Southwest Winter Injury on Deciduous Trees