Hi
It looks like a begonia ,did you empty old bedding pots on last year they may have survived

Gg

Bergenia , maybe.

I thought begonia too. a previous plant may have seeded and over the last few years they may have been growing un-noticed.
There are hardy ones. I had B sutherlandii for years in the open garden until the winter of 2010/11 killed it.

Looks like a begonia to me, when it flowers you might have a better idea :)

Tuberous Begonia

Thank you very much for all your help!! I was thinking it looked like a Japanese pumpkin or a bottle gourd but bit different and strange to have it in flower bed. I have never had a begonia before so I couldn't imagine it. I am so glad to have them and excited to see flowers! Thank you!!