Most definately lenticular of some type.
Just because they are low level does not mean they are not Lenticular. Sometimes lenticular can be created by 2 different air masses colliding - no real ground feature is/needs to be involved............
Often conventional cloud formations are distorted by wave impact as well and these can take on a lenticular type shape and properties..........
I'd suggest your clouds fall in the latter category.................
Arc