What Pennsylvania can do
A state legislator can introduce a resolution expressing the Pennsylvania House’s position and urging other governments to act. That is what Maloney says he plans to do.
What the current proposal is not
It is not yet an introduced resolution. It is a co-sponsorship memo. The Pennsylvania General Assembly page explicitly says the document has not been submitted for introduction.
Where federal naming comes in
The U.S. Board on Geographic Names standardizes geographic names used by the federal government, working within the Department of the Interior. Maloney’s proposal asks the President, Congress and the Interior Secretary to act, rather than claiming Pennsylvania can make the change unilaterally.
What about Canada?
Lake Erie is international water shared by the United States and Canada. A U.S. federal naming decision would govern U.S. federal usage; it would not force Canada to use the same name.
Bottom line
Could “Lake Pennsylvania” become a U.S. federal name someday? A federal process could potentially change federal usage. Has Pennsylvania renamed Lake Erie today? No.