Kind of, Yes. There were SPARC ports of two LTS releases: 8.04 and 10.04 server. After 10.04 however no-one was actively maintaining the ports so that was the last one. 12.04 does not have a SPARC port, and I haven't heard of anyone working on the port.

Theoretically 10.04 server is supported until April 2015, however since no-one appears to be maintaining the SPARC ports it seems unlikely that there will be any updates. What there is of 10.04 for SPARC is here. Scroll down to the bottom for most of the SPARC downloads

It seems unlikely that there would be many people here who have used the SPARC port, but you might ask around the SPARC community to get their thoughts on it.