The shape has some similarities with a vase on page 55 of Truitt's Bohemian Glass 1880-1940, no 3. But that one is round and has a taller neck and isn't flattened ..

but really it does have similarities and has the three little feet like yours, which I'm sure I recollect seeing on other Harrach pieces as well. Harrach also liked their oval flattened type shapes. So it's possible the blank might be Harrach.
The decoration reminds me of enamel work, in terms of the style and the colours of the greens on the leaves, that I've seen on tumblers id'd as Fritz Heckert. So maybe the decoration could be Harrach or Fritz Heckert perhaps?
I've not managed to find anything signed on quick searching, to definitely match but those are the options I'd explore.
Please could you possibly put a very clear close up of the decoration of the insects on as well? I'd love to compare them with those on a jug I have but need clear very close close ups? Many thanks if you have time.
It's lovely btw - I would have liked to have found it

m