That is squash or pumpkin .
Looks like a squash to me - I thought watermelon form the little photos, but when I made them bigger - definitely some kind of squash/zucchini type thing... You'll have to let us know what you get out of it.

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That is squash or pumpkin .

Both of those are in the C. pepo group . They could cross with many squash and ornamental gourds . It is probably the largest group in the squash family . There are so called pumpkins in all 4 groups . Jack-o-lantern types are C. pepo . It is definately not watermelon .I didn't grow those, but I did throw out compost that had watermelon and pumpkins and maybe some zucchini.
Haven't had plants stolen, but several people stopped and picked flowers. Someone did take a big flat sandstone rock that probaby weighed 100 pounds. It was the grave marker for my 19 year old cat. She used to lay on the stone while I worked in the rock garden and front flower beds. So I had buried Mauvis under her rock. Couldn't believe anyone would take that. We live on an asphalt two lane highway.I put a plethora of landscape plants into the ground today (4 varieties of hosta, heuchera, hydrangea, azalea, foam flower, speedwell, lamb's ear, coneflower, shasta daisies, ferns, bleeding hearts, etc.). Most were planted under the pine trees in front of our house, near the road, about 40-50' from our front door. After everything was in, my husband mentioned to me that he thinks I just wasted all my time and money because he thinks people are going to steal them. His parents, who live 1.5 miles from us, always lose anything they plant down by their drive. Apparently, people just drive up during the night, on a couple different occasions, and have dug up their freshly planted hostas and daylilies. (Their house is set far back from the road and they can not see the end of their drive from their house.) But, now I'm totally paranoid that someone is going to steal several hundred dollars worth of plants that I just spent all day putting in. Have any of you ever had a problem with people stealing any plants that were near the road?
I put a plethora of landscape plants into the ground today (4 varieties of hosta, heuchera, hydrangea, azalea, foam flower, speedwell, lamb's ear, coneflower, shasta daisies, ferns, bleeding hearts, etc.). Most were planted under the pine trees in front of our house, near the road, about 40-50' from our front door. After everything was in, my husband mentioned to me that he thinks I just wasted all my time and money because he thinks people are going to steal them. His parents, who live 1.5 miles from us, always lose anything they plant down by their drive. Apparently, people just drive up during the night, on a couple different occasions, and have dug up their freshly planted hostas and daylilies. (Their house is set far back from the road and they can not see the end of their drive from their house.) But, now I'm totally paranoid that someone is going to steal several hundred dollars worth of plants that I just spent all day putting in. Have any of you ever had a problem with people stealing any plants that were near the road?