It’s called the Lotta Crabtree “Cottage,” but this sprawling lakefront home is large in size, history and modern amenities. The home has 8 bedrooms, 2.5 bathrooms — plus another that is being finished now by the contractor/owner — and there is a potential bathroom roughed out in the basement, said listing agent Robin Dora of Prominent Properties Sotheby’s International Realty. “There’s no other home like this left on Lake Hopatcong,” Dora said. The 18-room mansion sits on nearly an acre and is listed for $3.49 million. Lotta Crabtree — known as Lotta because she only needed one name in her day…