Available as a vector file in many places
https://www.vectorstock.com/royalty-free-vector/cloud-alphabet-for-design-vector-3397931
https://www.123rf.com/photo_34520939_cartoon-cloud-alphabet-for-design-vector-font.html
https://www.dreamstime.com/stock-illustration-cloud-alphabet-design-cartoon-vector-font-image47388331

this thread's in french, but you might be interested in clicking all the different links you'll find: https://www.dafont.com/forum/read/8638/police-nuage-cloud-font